问一道情态动词表推测的单选题

显示全部楼层 · 2013-3-11 18:03:06

考点must表示对过去某时正发生的事情的推测，must 后面要接不定式的完成进行式。如　 ---Why didn't you answer my phone call? 　 ---Well, I must have been sleeping, so I didn't hear it.现在本题答案就明晰了是C...

千问 · 2013-3-11 18:03:06

D首先，题干告诉我们应该用过去进行时：was/were doing sth.但这里有must，must的固定搭配是must be doing sth.故选D...