单项选择题

I would like to know ______ she is an elected official or an appointed one.

A．if
B．why
C．how
D．when
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单项选择题
My neighbor ______ the piano; he usually practices at about this time.
A．used to practice
B．would practice
C．is practicing
D．practiced
单项选择题
Mr. Grace ran all the way up to the lecture room only ______ that the lecture was over 15 minutes ago.
A．to find
B．finding
C．found
D．finds
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