单项选择题

Only when one loses freedom（）one know its value.

A、 should
B、 does
C、 did
D、 might

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单项选择题
If I（）harder for the final exam, I should have passed it.

A、 study
B、 had studied
C、 studied
D、 was studying
单项选择题
He left,（）by anyone.

A、 not notice
B 、not being noticed
C、 being not noticed
D、 not noticing
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