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Since it will take years to know the eff...

Since it will take years to know the effect of genetically modified food, it’s more sensible to give it a second thought before we eat it,        it?

A.isn’t            B.is                C.won’t           D.will

 

A 【解析】 试题分析:句意:既然花费了几年的时间已经知道转基因食物的影响了,那么在吃它们之前需思考一下是更明智的是吗?这是反意疑问句,它的后半部分与主句的主语及谓语保持一致,因为前面是肯定的,所以后面用否定的,故选A。 考点:考查反意疑问句的用法。
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