9. Five coronal mass ejections have been released from the sun in a short period of time, _______ due to hit the Earth and cause geomagnetic storms.
(A) three of them
(B) three of which are
(C) three of them are
(D) three are

答案：登入後查看
統計： A(40), B(146), C(69), D(4), E(0) #3245024

詳解 (共 6 筆)

#6287658
關係代名詞:通常用 who 來代替『人...
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#6424493
(A) three of them→ 缺...
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#7385386
答案：B three of which...
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#6404685
Five coronal mass ejections have been released from the sun in a short period of time, three of which are due to hit the Earth and cause geomagnetic storms.
太陽在短時間內發生了五次日冕物質拋射，其中三次將襲擊地球並引發地磁風暴。
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#7388563

這題之所以不能選 (C)，關鍵在於「一個句子裡不能同時存在兩個獨立的完整子句，卻沒有連接詞來連接」。這是多數英文文法測驗中最經典的「逗號連接兩個句子（Comma Splice）」的錯誤。

以下為您拆解為什麼 (C) 是錯的，而 (B) 才是正確答案：

1. 拆解句子結構

我們先把這個句子簡化，看它的核心結構：

  • 前半句： Five coronal mass ejections have been released...（有主詞、有動詞 have been released，這是一個完整的獨立子句）。

  • 後半句（如果選 C）： ..., three of them are due to hit...（three of them 是主詞，are 是動詞，這又是一個完整的獨立子句）。

2. 為什麼 (C) 錯誤？

在英文文法中，一個「逗號（,）」是沒有能力直接連接兩個完整子句的。如果您想用 (C)，句子必須加上對等連接詞（如 and），或者把逗號改成句號/分號：

  • 錯誤： ..., three of them are due to hit... (X)

  • 正確： ..., and three of them are due to hit... (O)

  • 正確： ... . Three of them are due to hit... (O)

3. 為什麼 (B) 才是正確答案？

選項 (B) 使用了關係代名詞 which（three of which are）。 關係代名詞 which 在這裡同時兼具了兩個功能：

  1. 代名詞功能： 代替前方的名詞（coronal mass ejections 中的三個）。

  2. 連接詞功能： 它本身就相當於 and，因此它有能力把後半句變成一個「形容詞子句」，並用一個逗號與前半句完美連接。

  • 公式對等： three of which are ＝ and three of them are

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#6464701

Full sentence:

Five coronal mass ejections have been released from the sun in a short period of time, three of which are due to hit the Earth and cause geomagnetic storms.

Explanation:

This sentence requires a relative clause to provide more information about the five coronal mass ejections. The phrase “three of which are” is the proper relative clause structure here. It refers to part of a previously mentioned group ("five coronal mass ejections") and provides extra information.

Let’s break down why the others are incorrect:

  • (A) three of them – This is a noun phrase, not a clause, so it doesn’t connect grammatically to the rest of the sentence.

  • (C) three of them are – This forms a new independent clause, making the sentence a run-on.

  • (D) three are – Similar to (C), it begins a new clause without proper punctuation or connection.

✅ Correct structure: [main clause], [relative clause beginning with 'of which']
Hence, (B) is the only grammatically correct choice. 

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