单项选择题

Sam was very ill, so his mother sent ______ a doctor.

A．for
B．away
C．out
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单项选择题
I just don't enjoy ______ in this classroom; it is so crowded.
A．sitting
B．to sit
C．sit
单项选择题
When I opened the door. I found a dog ______ in the snow.
A．lie
B．lying
C．lay
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