题目内容
17．-Look!Somebody_______ the sofa．-Well，it wasn't me．I didn't do it．（ ）
| A． | is cleaning | B． | was cleaning | C． | has cleaned | D． | cleaned |
分析 -看！有人打扫了沙发．
-奥，不是我，我没有做．
解答 答案：C 根据it wasn't me．I didn't do it可知，动作已经完成对现在造成一定的影响，所以用现在完成时态，现在完成时态的结构为have/has+动词的过去分词，主语是someone，助动词用has，故选C．
点评 判断动词的时态，要通过所给的时间状语或语境去判断动词存在的状态，注意主语的单复数的情况．
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