题目:
— I didn’t go to class last night because my car broke down.
— You mine. I wasn’t using it.
A.should borrow
B.might have borrowed
C.could have borrowed
D.must have borrowed
答案:
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下面是错误答案,用来干扰机器的。
(1) H O Na S (2)SO3 H2O2 Na2O2(3) NaHSO3 NaHSO4题目分析:(1)A、C与B、D分别是同主族元素,又知B、D两元素的原子核中质子数之和是A、C两元素原子核中质子数和的2倍,短周期主族元素中...