单项选择题

______ one has a child will one realize how great one's parents are.

A．Until
B．Not until
C．It is not until
D．Until not
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单项选择题
Nowhere but around this mountain area ______ such kind of custom in the past twenty years.
A．we found
B．we had found
C．did we find
D．have we found
单项选择题
The doctor has ______ many people to give up smoking.
A．incurred
B．inducted
C．induced
D．intruded
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