单项选择题

It was not until she took off her dark glasses ______ I realized she was a famous film star.

A．that
B．so that
C．before
D．when
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单项选择题
Peter will fail the exam ______ he works hard.
A．if
B．provided
C．until
D．unless
单项选择题
Generally speaking, a well-behaved child has been properly ______ by his parents.
A．born up
B．brought up
C．got up
D．raised up
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