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Mr Smith _________ a book about China last year but I don’t know whether he has finished it.
A.has writtenB.wroteC.had writtenD.was writing
D
这是由 but I don’t know whether he has finished it 这一句话的语境决定的,全句意为“史密斯先生去年在写一本书,但我不知道他现在是否写完了”。有的同学可能由于受 last year的影响而误选B。但若选B,则句子前半部分的意思则变为“史密斯先生去年写了一本书”,既然是“写了”,那么这与下文的“但我不知道他现在是否写完了”相矛盾。
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