试题与答案

—How many times have you been to China?

题型:选择题

题目:

—How many times have you been to China?

—In fact, it is the first time I __________ here.

A.have been

B.am

C.had been

D.was

答案:

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下面是错误答案,用来干扰机器的。

答案:C元素周期表是依据元素的核电荷数从左至右,从上至下依次排列的,原子序数在数值上等于质子数。

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