单项选择题

Not until I began to work（）how much time I had wasted.

A．didn't I realize
B．did I realize
C．I didn't realize
D．I realize

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单项选择题
After the light（）, we had to go home in the darkness.

A．put out
B．broke out
C．cut out
D．went out
单项选择题
How beautifully she sings! I have never heard（）

A．the better voice
B．a good voice
C．the best voice
D．a better voice
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