- Someone is knocking at the door.  
- It ______ be Tom. He is still in the school.
A.can’tB.mustn’tC.couldnotD.might; not
A

試題分析:句意:有人在敲門。不可能是湯姆,他還在學(xué)校。A 不可能是,表示否定回答;B 禁止;C 不能;D 或許不是。結(jié)合語(yǔ)境,選A,表示完全否定的推測(cè)。
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