单项选择题

______ if he'd ever been fined before, Mathew replied, "Only for speeding. "

A．Asking
B．Asked
C．To ask
D．Having asked
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单项选择题
Mack is very busy; he is a full-time student, while______ a part-time job.
A．to hold
B．being held
C．held
D．holding
单项选择题
It was a big celebration-______people gathered at the city square.
A．five thousands
B．five thousand
C．thousands
D．thousand of
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