单项选择题
It's not an easy task. However, please have him ______ it.
A．do
B．to do
C．done
D．doing
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单项选择题
Alice had a terrible time touring that country. Not a day ______ without having some unpleasantness with waiters in the hotel.
A．she spent
B．she spends
C．did she spend
D．had she spent
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单项选择题
The greatest invention of the 20th century is ______ computer.
A．/
B．the
C．a
D．an
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