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

【答案】have shut

【解析】

句意:我不確定我是否已經(jīng)把所有的窗戶都關(guān)上了。

此題是由whether引導(dǎo)的賓語(yǔ)從句,由already可知,賓語(yǔ)從句應(yīng)該用現(xiàn)在完成時(shí),其結(jié)構(gòu)是:助動(dòng)詞have/has+動(dòng)詞的過(guò)去分詞。本題的主語(yǔ)是I,因此助動(dòng)詞用have。故答案為:have shut。

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