单项选择题

At last, we found ourselves in a pleasant park with trees providing shade and ______ down to eat our picnic lunch.

A．having sat
B．sitting
C．to sit
D．sat
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单项选择题
The Reform Committee proposed that wages ______.
A．would have been raised
B．would be raised
C．be raised
D．were raised
单项选择题
John became a football player ______ the beginning of March.
A．on
B．with
C．for
D．at
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