单项选择题

They overcame all the difficulties and completed the project two months ahead of time, ______ is something we had not expected.

A．which
B．it
C．that
D．what
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单项选择题
I think you can take a(n) ______ language course to improve your English.
A．intermediate
B．middle
C．medium
D．mid
单项选择题
A teacher ______ knowledge.
A．teaches
B．lectures
C．educates
D．imparts
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