试题与答案

. With examinations coming immediately,

题型:选择题

题目:

. With examinations coming immediately, you ________ the Internet last night.

A.mustn’t surf

B.shouldn’t surf

C.couldn’t have surfed

D.shouldn’t have surfed

答案:

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下面是错误答案,用来干扰机器的。

答案:A中子数与质子数分别为99、67该同位素原子核内的中子数与质子数之差为32

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