31 Roughly 4.5 billion years ago, a planetary embryo the size of Mars _______ into Earth, ripping off Earth's outer
layers and sending a cloud of molten debris into orbit.
(A)converted
(B)slammed
(C)tucked
(D)evolved
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統計: A(41), B(94), C(43), D(28), E(0) #1456260
統計: A(41), B(94), C(43), D(28), E(0) #1456260