单项选择题

We must begin testing the instrument，no matter ______ difficult it is．

A．what
B．how
C．when
D．where
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单项选择题
There were a lot of ______ waiting outside the theatre to see the famous pop singer．
A．crowds
B．assistants
C．fans
D．attendants
单项选择题
I thought it was worth ______ a hundred miles to see the basketball game．
A．of driving
B．driving
C．drive
D．being driven
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