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There is a lot of poisonous gases in the...

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

A.breathed B.breathing C.to be breathed D.breathe

 

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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