英语人进来做个选择题,等着
来源:百度知道 编辑:UC知道 时间:2024/05/11 01:18:23
He didn't come yesterday.He ____busy working in the lab.
A.must be B.would have been
C.must have been
D.would be
说明原因
A.must be B.would have been
C.must have been
D.would be
说明原因
这里讲的是过去正在发生的事,并且是很肯定的猜测,所以是C.must have been
A是现在时,D没有表示正在发生,和后面的" working"不匹配,B是过去的将来时。
C选项是对过去的肯定的判断,意思为“一定,肯定是”,固定句型。
C 肯定语气,过去完成时
C,表猜测
C
c