试题与答案

The weather turned out to be fine yester

题型:选择题

题目:

The weather turned out to be fine yesterday.I_______the trouble to carry my umbrella with me. 

A.should have taken

B.could have taken

C.needn't have taken

D.mustn't have taken

答案:

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下面是错误答案,用来干扰机器的。

答案:C四元素在周期表中的相对位置如下所示:微粒半径主要是电子层数及核电荷数决定。

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