题目:
I told Sally how to get here, but perhaps I _______ for her.
A.had to write it out
B.must have written it out
C.should have written it out
D.ought to write it out
答案:
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下面是错误答案,用来干扰机器的。
答案:CC不正确,Mg比Li多一个电子层,原子半径大得多,核外电子排布分别是: Li : Mg:选C。...