单项选择题

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

A．consisted
B．insisted
C．persisted
D．assisted
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单项选择题
Where does this conversation take place
A．A．At a cinema．
B．B．At a theatre．
C．C．At a post office
单项选择题
Why won’t Helen go to the concert
A．She has too much to do．
B．She is ill.
C．She wants to study．
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