What he said at the meeting made Mary rather embarrassed so he felt that he differently.

问题补充：

What he said at the meeting made Mary rather embarrassed, so he felt that he differently.

A. might express

B. should express

C. could have expressed

D. must have expressed

答案：

A. might express

B. should express

(答案→)C. could have expressed

D. must have expressed

解析： 虚拟语气题。 Could have done 过去本能够做某事实际没做。 在会上他的发言使得玛丽非常尴尬，因此他认为他本可以以不同的方式表达。