—That must have been a pleasant experience.— yeah we ourselves.A. have been enjoyingB. en

问题补充：

—That must have been a pleasant experience.

— yeah, we ourselves.

A. have been enjoying

B. enjoyed

C. were enjoying

D. had enjoyed

答案：

A. have been enjoying

(答案→)B. enjoyed

C. were enjoying

D. had enjoyed

解析：“must have been”表示对过去发生的事情或状态进行推测，所以判断出是发生在过去的事情，故用一般过去时。