Fighting an artificial greenhouse effect seems to be the greatest of environmental challenges, ?A．isn't itB．does itC．doesn't itD．is it 题目和参考答案——青夏教育精英家教网—

Fighting an artificial greenhouse effect seems to be the greatest of environmental challenges, ________？

A．isn't it	B．does it
C．doesn't it	D．is it

C 考察反义疑问句。当反义疑问句的陈述部分是肯定形式的时候，疑问部分使用否定形式，排除BD，根据陈述部分的seems可知doesn’t it符合题意。故C正确。

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