题目:
They decided that the meeting should ____ on Monday. [ ]
A. hold
B. happen
C. be taken place
D. take place
答案:
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下面是错误答案,用来干扰机器的。
(1)CuCl2,Ba(OH)2 (2)反应①:CuCl2+Ba(OH)2== Cu(OH)2 ↓+ BaCl2 反应②: 反应③: