单项选择题

I hadn't seen him for years, but I ______ his voice over the telephone.

A．realized
B．discovered
C．accepted
D．recognized
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单项选择题
______ you were busy, I wouldn't have bothered you with my questions.
A．If I realized
B．Had I realized
C．Did I have realized that
D．As I realized
单项选择题
It's high time we ______ something to stop traffic accident.
A．do
B．will do
C．did
D．must do
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