---I rang you yesterday afternoon. A man answered, but I didn’t recognize the voice.Oh

---I rang you yesterday afternoon. A man answered, but I didn’t recognize the voice.
--- Oh, it my uncle. He was in my room then.
A. must have been
B. should have been
C. must be
D. should be

(答案→)A. must have beenB. should have beenC. must beD. should be解析：考查情态动词表推测。因为是对过去事实表推测，要用情态动词加完成时态，排除C,D；should have been表本应该是实际不是；must have been肯定是；根据He was in my room then，可知是我叔叔的可能性很大。所以选A。

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