45. What is the meaning of the idiom "grist ... to the mill' in the second patagtaph?
(A) irrelevant stuff
(B) extraneous fuel
(C) wasteful lubrication
(D) uscful material

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統計： A(1), B(5), C(1), D(0), E(0) #3024625

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【題組】45. What is the...
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