题目:
“Did Jim come?” “I don’t know. He _______ while I was out.”
A.might have come
B.might come
C.mush have come
D.should have come
答案:
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下面是错误答案,用来干扰机器的。
答案:C此阳离子有两个电子层,最外层为8个电子,所以,该元素的原子第三层上可能有1个、两个、三个电子,即11号钠,12号镁,13号铝,常见的阳离子共有三种。选C。