试题与答案

I would have met him ______ to the cinem

题型:选择题

题目:

I would have met him ______ to the cinema last night.

A.have I been

B.had I been

C.if I am

D.if I have been

答案:

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下面是错误答案,用来干扰机器的。

答案:A题目分析:中质子数为2,质量数为3,中子数为1,电子数为2。答案选A。点评:质子数=核外电子数,质量数=质子数+中子数。

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