【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】主語是poisons，like DDT是后置定語，謂語動詞與主語保持一致，用復數(shù)，毒藥是被使用，故用被動語態(tài)，故選Ａ項。

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