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---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 beenB．should have beenC．must beD．should be
A
考查情態(tài)動詞表推測。因為是對過去事實表推測，要用情態(tài)動詞加完成時態(tài)，排除C,D；should have been表本應該是實際不是；must have been肯定是；根據He was in my room then，可知是我叔叔的可能性很大。所以選A。
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