单项选择题

The police arrived at the spot, ______ the situation became calmer.

A．before which
B．in that
C．for that
D．after which
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单项选择题
______ nobody was very enthusiastic about it, we decided to cancel the picnic.
A．Seen that
B．Seeing that
C．To see
D．Being seen
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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