【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】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(jìn)行時表示從過去到現(xiàn)在一直進(jìn)行的動作。所以選B。

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