题目内容
【题目】Scientists now say that five seconds is all that _______ takes for food to become contaminated with enough bacteria to make you sick.
A. it B. one C. that D. this
【答案】A
【解析】
试题分析:句意:……食物发生菌变使人生病需要5秒钟。it在本句中作形式主语,真正的主语为后面的动词不定式结构“to become contaminated with enough bacteria to make you sick”。故选A项。
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