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
After seeing what disaster he had brought to his family, he ______ of intemperate behavior.
A．admitted
B．confessed
C．repented
D．acknowledged
单项选择题
Modesty makes one progress ______ conceit makes one lag behind.
A．when
B．whereas
C．as
D．whereupon
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