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
______, liquids can be changed into gases.
A．Heating
B．To be heated
C．Heated
D．Heat
单项选择题
She______.
A．mustn't have hurried
B．couldn't have hurried
C．must not hurry
D．needn't have hurried
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