【題目】If poisons like DDT ______ to control insects, there will be serious environmental damage.

A．a(chǎn)re used B．is used C．use D．used

【答案】A

【解析】主語(yǔ)是poisons，like DDT是后置定語(yǔ)，謂語(yǔ)動(dòng)詞與主語(yǔ)保持一致，用復(fù)數(shù)，毒藥是被使用，故用被動(dòng)語(yǔ)態(tài)，故選Ａ項(xiàng)。

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