【題目】It’s high time we _____ some actions to prevent pollution.

A. take B. took C. taking D. is taking

【答案】B

【解析】

試題分析：考察虛擬語(yǔ)氣。It’s high time that從句中必須使用虛擬語(yǔ)氣，即從句使用過(guò)去式或謂語(yǔ)由“should＋動(dòng)詞原形”構(gòu)成，后種變化的should不能省略，所以答案是B。

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