单项选择题

Man in general does not appreciate what he has （） he loses it.

A．after
B．until
C．before
D．when

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单项选择题
Small children can not （） the different between right and wrong.

A．appreciate
B．confess
C．enjoy
D．acknowledge
单项选择题
Tom didn't go to the party last night because he （） the baby for his sister until 10:50.

A．had to look after
B．should have looked after
C．would have to look after
D．must have looked after
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