---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

解析試題分析:考查情態(tài)動(dòng)詞用法。A必須;B能夠,可能;C 需要;D將會(huì)。從句意可知此處表示推測(cè),而must表推測(cè)時(shí)只用于肯定句,C、D選項(xiàng)意思不恰當(dāng),can表推測(cè)可以用于否定句和疑問句表示“可能”,所以B選項(xiàng)正確。句意:--有人在敲門?赡軙(huì)是誰呢?--肯定是約翰。他答應(yīng)八點(diǎn)鐘來這兒了。
考點(diǎn):考查情態(tài)動(dòng)詞用法。

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