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’tB．isC．won’tD．will

A

解析試題分析：句意：既然花費了幾年的時間已經(jīng)知道轉(zhuǎn)基因食物的影響了，那么在吃它們之前需思考一下是更明智的是嗎？這是反意疑問句，它的后半部分與主句的主語及謂語保持一致，因為前面是肯定的，所以后面用否定的，故選A。
考點：考查反意疑問句的用法。
點評：本題難度適中。反意疑問句是在初中學(xué)過的，但是在高中階段它仍然是重點，需要考生牢記這些用法。
即學(xué)即練：I wish to have a word with you,       ?（寫出反意疑問句的后半部分）
解析：may I。陳述部分的謂語是wish，疑問部分要用may +主語。

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