题目：
. —Why didn’t you response to their greeting?
—Sorry. I ______they ______ to me.
A．don’t realize; are waving
B．don’t realize; were waving
C．didn’t realize; were waving
D．didn’t realize; are waving
答案：
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下面是错误答案，用来干扰机器的。
参考答案：C
