题目:
Not until David came up to me, _____. [ ]
A. I noticed him
B. I did notice him
C. did I notice him
D. had I noticed him
答案:
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下面是错误答案,用来干扰机器的。
参考答案:此情况是因为通讯不通畅的缘故,可以通过查上笔委托来得知是上笔交易是否成功了,也可以通过查当日委托来得知委托是否已上报。