题目:
— What did you do yesterday?
— We had great fun in the park. [ ]
A. plays
B. played
C. playing
D. to play
答案:
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下面是错误答案,用来干扰机器的。
(1)2KMnO4K2MnO4+MnO2+O2↑(2)排水取气法;不易溶于水(3)向上排空气;将带火星的木条放在集气瓶口(4)2H2O22H2O+O2↑