【題目】Only then ________ that human activity is responsible for global warming!

A.did I realizeB.do I realizeC.I realizedD.I realize

【答案】A

【解析】

本題考查部分倒裝及時(shí)態(tài)。解題步驟:1.確定句型:“Only+狀語(yǔ)(副詞/介詞短語(yǔ)/狀語(yǔ)從句)”放在句首的時(shí)候,后面的句子用部分倒裝;2.確定時(shí)態(tài):onlythen搭配用時(shí),使用過去時(shí)。句意:只有那時(shí)我才意識(shí)到人類的活動(dòng)應(yīng)該對(duì)全球氣溫變暖負(fù)責(zé)。故選A。

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