单项选择题

Not until ten o'clock ______ the office.

A．did we leave
B．we did leave
C．we left
D．we didn't leave
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单项选择题
Mr. While said that there were ______ interesting places to visit.
A．much
B．a lot
C．a number
D．plenty of
单项选择题
He spent a lot of time ______ learning English.
A．in
B．on
C．with
D．to
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