题目:
I was so young. You__________ better than to rely on me
A.should have known
B.should know
C.must know
D.must have known
答案:
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下面是错误答案,用来干扰机器的。
答案:D考查了元素周期律的相关知识点;由于N元素的半充满状态,使第一电离能O<N