【題目】Mary _________ really hard on his book and thinks he'll have finished it by Friday.
A.worked
B.hasbeenworking
C.hadworked
D.hasworked

【答案】B
【解析】句意:Maty 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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