【題目】Mary really hard on his book and thinks he’ll have finished it by Friday.

A. worked B. has been working

C. had worked D. has worked

【答案】B

【解析】試題分析：句意：Marty一直努力寫書，我想他到周五為止將已經(jīng)完成了。用現(xiàn)在完成進行時表示從過去到現(xiàn)在一直進行的動作。所以選B。

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