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---There’s someone knocking on the door....

---There’s someone knocking on the door. Who _________ it be?

---It must be John. He promised to be here at 8:00.

A. must         B. can          C. need       D. shall

 

B 【解析】 试题分析:考查情态动词用法。A必须;B能够,可能;C 需要;D将会。从句意可知此处表示推测,而must表推测时只用于肯定句,C、D选项意思不恰当,can表推测可以用于否定句和疑问句表示“可能”,所以B选项正确。句意:--有人在敲门。可能会是谁呢?--肯定是约翰。他答应八点钟来这儿了。 考点:考查情态动词用法。
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