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。