【题目】If poisons like DDT ______ to control insects, there will be serious environmental damage.
A．are used B．is used C．use D．used
在线课程【答案】A
【解析】主语是poisons，like DDT是后置定语，谓语动词与主语保持一致，用复数，毒药是被使用，故用被动语态，故选Ａ项。
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