Fighting an artificial greenhouse effect seems to be the greatest of environmental challenges, ________？
A．isn't itB．does it
C．doesn't itD．is it
C
C 考察反義疑問句。當(dāng)反義疑問句的陳述部分是肯定形式的時候，疑問部分使用否定形式，排除BD，根據(jù)陳述部分的seems可知doesn’t it符合題意。故C正確。
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