---How clean the bedroom is! ---Yes, I am sure that someone ______ it.
---How clean the bedroom is! ---Yes, I am sure that someone ______ it.
A. cleans B. cleaned C. has cleaned D. is cleaning
【答案】C
【解析】句意：——卧室多干净啊！——是的，我肯定有人把它打扫过了。考查动词时态辨析题。根据句意和语境，可知对句需用现在完成时态；因为someone是三单人称，需借助has+过去分词构成完成时，故选C。
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