单项选择题

Central-heating is one of the modern ______ the newly-built apartment building provides.

A．impressions
B．competitions
C．satisfactions
D．conveniences
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单项选择题
To my surprise, every guest arrived late at the party, for ______ reasons.
A．a fraction of
B．a section of
C．a series of
D．a variety of
单项选择题
He had had a long and uncomfortable trip, for he had been confined ______ the wooden box for over ten hours.
A．beyond
B．in
C．on
D．to
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