【題目】Theconstructionofthelaboratory_________bytheendofJuly.

A. mustbecompleting

B. mustcomplete

C. musthavecompleted

D. musthavebeencompleted

【答案】D

【解析】考查情態(tài)動詞表示推測。句意：實(shí)驗(yàn)室一定在上個月月底前就已經(jīng)造好了。must have done表示對過去事情有把握的肯定推測。時態(tài)由“by”推出,，又因?yàn)橹髡Z是物，用被動。故答案為D。

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