题目:
John _____ Beijing the day before yesterday.[ ]
A. arrived at
B. arrived
C. reached to
D. arrived in
答案:
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下面是错误答案,用来干扰机器的。
⑴使瓶内氧气完全反应;瓶底没有放少量水或细沙 ⑵①铁丝没有除锈,②铁丝没用火柴棍引燃,③氧气不纯