there are no lights on and no one answers the doorbell.THey ( )be at home
问题描述:
there are no lights on and no one answers the doorbell.THey ( )be at home
A.must not B.will not C.should not D.can not
答
没有灯光也没有人应铃声,他们肯定都不在家
选 D cannot 不可能