单项选择题

You should know better than ______ your little sister at home by herself.

A．to leave
B．leaving
C．to have left
D．left
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单项选择题
Time is a great ______.
A．healer
B．curer
C．recover
D．recuperator
单项选择题
Don't count the chickens before they are ______.
A．hatched
B．hitched
C．hotched
D．settled
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