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doesnt it符合題意。故C正確。

 

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