题目内容
6．Plastic bags（塑料袋） have caused serious environmental pollution，_______________？（ ）| A． | haven't they | B． | have they | C． | don't they | D． | do they |
分析 塑料袋已经引起了严重的环境污染，是吗？
解答 答案：A． 根据Plastic bags（塑料袋） have caused serious environmental pollution和反意疑问句的结构特点"前肯后否"和"前否后肯"的特点可知，此句是肯定句，后句应该是否定句；并且是现在完成时态，所以后句助动词应该用have；Plastic bags是名词的复数形式，用代词代替的话应该用they，故选A．
点评 本题主要考查反意疑问句的结构特点，做题时注意时态和助动词的使用．还要注意汉语意思前后一致．
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