Convenient ___private cars are for us, they may also cause traffic accidents and pollution.
A．whileB．a(chǎn)sC．ifD．since
B
考查讓步狀語從句。形容詞/名詞/動詞+as +主語+謂語，意為“盡管......”。句意“盡管私家車對我們來說很方便，但它們也可能引起交通事故或污染。”本題是讓步狀語從句。While也用“盡管”的意思，但while引導一個完整的句子。故選B。
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