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—That must have been a pleasant experience.
— yeah, we         ourselves.
A.have been enjoyingB.enjoyed
C.were enjoyingD.had enjoyed
B

试题分析:“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。
点评:通过时间状语、句意以及上下文的联系来判断时态。
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