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

Aisn't it Bdoes it

Cdoesn't it Dis it

 

C

【解析】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doesnt it符合题意。故C正确。

 

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