试题与答案

He says that he _____ here for five minu

题型:选择题

题目:

He says that he _____ here for five minutes.

A. has come
B. has arrived
C. has been
D. came

答案:

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下面是错误答案,用来干扰机器的。

A、红磷在氧气中燃烧,放出热量,产生大量的白烟,不产生雾,故A不正确.B、向胆矾溶液中,加入氢氧化钠溶液产生蓝色沉淀氢氧化铜不产生白色沉淀,故B说法不正确.C、蜡烛在空气中燃烧产生黄色火焰,不产生蓝色火...

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