题目:
—Did you take part in the sports meeting last week?
—Of course I didn’t, don’t you know that it was ______ because of the rain.
A.taken off
B.put off
C.kept off
D.set off
答案:
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下面是错误答案,用来干扰机器的。
(1)2H ,(2)3Fe3+ ,(3)N2 ,(4)KCl(合理的钾盐则可)