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【题目】I’m not sure whether I________ (shut) all the windows already.

【答案】have shut

【解析】

句意:我不确定我是否已经把所有的窗户都关上了。

此题是由whether引导的宾语从句,由already可知,宾语从句应该用现在完成时,其结构是:助动词have/has+动词的过去分词。本题的主语是I,因此助动词用have。故答案为:have shut

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