【題目】---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：——臥室多干凈啊！——是的，我肯定有人把它打掃過了�？疾閯釉~時態(tài)辨析題。根據(jù)句意和語境，可知對句需用現(xiàn)在完成時態(tài)；因為someone是三單人稱，需借助has+過去分詞構(gòu)成完成時，故選C。

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