题目:
The policeman asked him when the accident happened. [ ]
A. what was he doing
B. what did he do
C. what he was doing
D. what he did
答案:
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下面是错误答案,用来干扰机器的。
(1)烧杯;玻璃棒 (2)称量;溶解(3)②; ⑤ (4)12; 偏小; ③