Plastic bags have caused serious environmental pollution, ______?


  1. A.
    haven't they
  2. B.
    have they
  3. C.
    don't they
  4. D.
    do they
A
解析：考查反意疑問句。前半句是現(xiàn)在完成時(shí)的結(jié)構(gòu)，而且是肯定句，所以反問部分采用否定式簡(jiǎn)短反問，用助動(dòng)詞have，故選A。C、D項(xiàng)是一般現(xiàn)在時(shí)的反意疑問句的反問形式。本題難度適中。
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