I didn’t see her in the meeting room this morning. She have spoken at the meeting.A. mus

问题补充：

I didn’t see her in the meeting room this morning. She have spoken at the meeting.

A. mustn’t

B. shouldn’t

C. needn’t

D. couldn’t

答案：

A. mustn’t

B. shouldn’t

C. needn’t

(答案→)D. couldn’t

解析：couldn’t have done sth 表示对过去情

况进行推测，意为“过去不可能发生过某情况”。