题目内容

Convenient ___private cars are for us, they may also cause traffic accidents and pollution.
A．whileB．asC．ifD．since
B
考查让步状语从句。形容词/名词/动词+as +主语+谓语，意为“尽管......”。句意“尽管私家车对我们来说很方便，但它们也可能引起交通事故或污染。”本题是让步状语从句。While也用“尽管”的意思，但while引导一个完整的句子。故选B。
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