—Is Pro. Smith giving the speech today?
—It __________ be him. He is abroad right now.
A．can’tB．needn’tC．won’tD．mustn’t
A
這題考查情態(tài)動(dòng)詞的用法，這里的can’t表示 推測(cè)，表示“不可能”，句意是：--斯密斯教授今天做演講嗎 ？--不可能是他。他現(xiàn)在在國(guó)外呢？選A。
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