Electronic devices such as iPods and headphones can do great harm to our hearing

Electronic devices such as iPods and headphones can do great harm to our hearing

题型:不详难度:来源:
Electronic devices such as iPods and headphones can do great harm to our hearing if _______ improperly.
A.being usedB.usedC.to be usedD.having been used

答案
B
解析

试题分析:句意:电子设备例如iPods和耳机,如果使用不当,能够对我们的听力造成极大的伤害。if后面的条件状语从句省略了they are ,根据句意用被动形式,故选B
点评:句中充当状语的从句叫状语从句。状语从句可置于句首、句末或句中,一般来说,状语从句都比较完整。但是,在一些状语从句中存在的省略问题,可以归纳为when, while, if, as if, although / though, as, until, once, whether, unless, where等引导的从句中,如果其谓语为be,而主语与主句的主语相同时,则从句的主语和be可省略。有时从句的主语为it时,也可省略it或从句中的有关成分。
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