单项选择题

I ______ when she knocked at the door.

A．cook
B．was cooking
C．am cooking
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单项选择题
It ______ me about forty minutes to do my homework every day.
A．spends
B．takes
C．uses
单项选择题
Please ______ page 54 and read Lesson Twelve.
A．turn to
B．turn on
C．turn into
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