---Is Johnson on duty today?

---It ________ be him, but I’m not sure.

A. will B. may

C. need D. must

 

B

【解析】

試題分析：考查情態(tài)動(dòng)詞。句意：--今天是約翰遜值日嗎？--可能是他，但我不確定。A愿意；B可能；C需要；D必須，一定。must表示肯定的推測(cè)，意為“一定”，根據(jù)答語(yǔ)后半句可知，“我”不確定是否是約翰遜值日，故選B。

考點(diǎn)：考查情態(tài)動(dòng)詞

 

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