单项选择题

A man escaped from the prison last night. It was a long time ______the guards discovered what had happened.

A．before
B．until
C．since
D．when
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单项选择题
The shoemaker can mend whatever______.
A．which needs mending
B．needs to be mended
C．it needs mending
D．that needs mending
单项选择题
After performing a successful operation, the doctor at last pulled the patient______.
A．back
B．in
C．up
D．through
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