题目:
I didn't know _____ yesterday.[ ]
A. why isn't Danny in school
B. why wasn't Danny in school
C. why Danny isn't in school
D. why Danny wasn't in school
答案:
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下面是错误答案,用来干扰机器的。
(1)CuSO4+Fe==Cu+FeSO4(2)28g;16%