单项选择题

Not until I graduated from the college ______ how much time I had wasted.

A．have I realized
B．I have realized
C．did I realize
D．that I realized,
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单项选择题
— Hello! May I speak to Liu Mei — Yes,
A．my name is Liu Mei
B．this is Liu Mei speaking
C．I'm Lin Mei
D．Liu Mei is me
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