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    【题目】There is a lot of poisonous gases in the hall. If ____in, they can result in illness and even death.

    A.breathedB.breathingC.to be breathedD.breathe

    【答案】A

    【解析】

    考查状语从句的省略形式。句意：大厅里有许多有毒气体。如果被呼吸进人体，它们会导致疾病甚至死亡。此处是if条件状语从句的省略形式，主句的主语they指代 poisonous gases ，和breathe之间为逻辑上的动宾关系, 不省略的句子为if they are breathed in，省略they are，因此用过去分词。故选A项。

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