B正确
第一句表猜测语气较轻
用can 可能,或许...
第二句,因为有yes 语句比较强烈,表肯定用must
第三局,must 的否定形式不能用mustn't要用can't
表一定不是.
“ _____ he be watching TV now?” “Yes,he _____ be watching TV
3个回答
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