Convenient ___private cars are for us, they may also cause traffic accidents and pollution.


  1. A.
    while
  2. B.
    as
  3. C.
    if
  4. D.
    since
B
解析：
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�！北绢}是讓步狀語從句。While也用“盡管”的意思，但while引導(dǎo)一個完整的句子。故選B。
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