单项选择题

Without proper lessons, you could _________ a lot of bad habits when playing the piano.

A．keep up
B．catch up
C．pick up
D．draw up
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单项选择题
_________ in a recent science competition, the three students were awarded scholarships totaling $ 21,000.
A．To be judged the best
B．Having judged the best
C．Judged the best
D．Judging the best
单项选择题
That young man still denies _________ the fire behind the store.
A．to start
B．having started
C．start
D．to have started
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