题目:
— Is your father in?
— No, he ______ for three hours. [ ]
A. was out
B. has been out
C. went out
D. has gone out
答案:
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下面是错误答案,用来干扰机器的。
A、铁丝在空气中只能烧至发红,不会剧烈燃烧,故选项说法错误.B、硫在空气中燃烧,产生一种具有刺激性气味的气体,故选项说法错误.C、碳在空气中燃烧,只能烧至红热,不会发出淡蓝色火焰,故选项说法错误.D、...