单项选择题

I felt very glad______he accepted my invitation.

A．that
B．if
C．whether
D．as
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单项选择题
You must make______clear that we are not affected by these changes.
A．that
B．this
C．it
D．/
单项选择题
The teacher didn't begin the class ______ all the students_______.
A．until, stopped to talk
B．before, stopped talking
C．while, stopped to talk
D．because, stopped talking
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