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
A．animalB．humanC．manD．creation
A．animal
B．human
C．man
D．creation
单项选择题
A．liveB．placeC．plantD．lie
A．live
B．place
C．plant
D．lie
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