— I saw Mr Li at the meeting yesterday.— Did you? He have attended it for he had asked f

问题补充：

— I saw Mr Li at the meeting yesterday.

— Did you? He have attended it, for he had asked for sick leave.

A. needn’t

B. couldn’t

C. shouldn’t

D. mustn’t

答案：

A. needn’t

(答案→)B. couldn’t

C. shouldn’t

D. mustn’t

解析：考查情态动词用法。Needn’t have done本不需要做某事，实际上却做了。Couldn’ t have done不可能做了某事；shouldn’t have done 本不应该做某事，实际上却做了；句意：—昨天在会议上我看见了李先生。—是吗？他不可能从句会议的，因为他已经请了病假了。故B正确。