单项选择题

Barbara ______ in doing it again though she had failed more than a dozen times.

A．insisted
B．persisted
C．assisted
D．consisted
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单项选择题
______ you object to a man, everything he does is wrong.
A．Unless
B．Provided
C．Once
D．In case
单项选择题
It is dangerous to ______ out of the window of the train.
A．look
B．lean
C．bend
D．slope
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