单项选择题

He never let me ________ when I need his support.

A．in
B．down
C．off
D．out
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单项选择题
We all feel sorry for ________ for so long after your arrival.
A．keep you waiting
B．having kept you waiting
C．waiting for you
D．keep you wait
单项选择题
________ is well known to all, China will be an advanced and powerful country in the near future.
A．As
B．That
C．This
D．It
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