摘要：2139] ----Who it be that is knocking at the door? -----It be father, but I’m not sure. [译文] --是谁在敲门? --也许是父亲.但我不太肯定. A. can; may B. must; can C. may; must D. need; should [答案及简析] A. 情态动词表示推测.can用于疑问句或否定句,may用于陈述句.
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