单项选择题

You must make______clear that we are not affected by these changes.

A．that
B．this
C．it
D．/
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单项选择题
The hole in the wall is large enough for a bird to fly through without touching ______.
A．either wing
B．each of their wings
C．any wing
D．both of the wings
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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