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
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单项选择题
______ a good thing they didn t catch you.
A．That"s
B．There"s
C．It"s
D．What"s
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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