单项选择题

It was 12 o'clock ______ the plane took off.

A．when
B．that
C．since
D．till
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单项选择题
The factory has done good honour to the government and the people around so that visitors come to it ______.
A．in number
B．in larger numbers
C．to the number
D．by number
单项选择题
Tom went out to play with his homework ______.
A．done
B．to do
C．doing
D．being done
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