单项选择题

The reason ______ he didn't attend the meeting was not made clear.

A．why
B．which
C．is
D．that
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单项选择题
I ______ for six years by the end of this year.
A．shall teach
B．was teaching
C．shall have been teaching
D．teach
单项选择题
It is a fact ______.English is being accept as an international language.
A．that
B．which
C．what
D．when
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