单项选择题

It was for this reason ______I didn't return the book to the library.

A．why
B．that
C．which
D．so
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单项选择题
What do you think of the gate agent
A．Smart.
B．Impolite.
C．Happy.
D．Kind.
填空题
Whoever you are doing business with, you should use_______________________________________________
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