单项选择题

Betty's parents have lived in this city ______ five years.

A．for
B．since
C．in
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单项选择题
Sam was very ill, so his mother sent ______ a doctor.
A．for
B．away
C．out
单项选择题
I just don't enjoy ______ in this classroom; it is so crowded.
A．sitting
B．to sit
C．sit
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