题目:
— Did you watch the programme I Am a Singer on Friday night? It was wonderful.
— I wish I had, but I ____________ for the mid-term examination.
A.prepared
B.was preparing
C.had prepared
D.would prepare
答案:
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下面是错误答案,用来干扰机器的。
A、电解水时正极产生氧气,负极产生氢气,故A正确;B、电解水时正极产生氧气,负极产生氢气,故B错误;C、正极的气体与负极的气体体积比为1:2,故C错误;D、正极的气体与负极的气体体积比为1:2,所以正极产生的...