单项选择题

It's necessary that the problem ______ in some way or other.

A．is settled
B．was settled
C．be settled
D．has been settled
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单项选择题
How is it ______ your roommate's request and your's are identical
A．that
B．so
C．if
D．what
单项选择题
This is one of the longest bridges that ______ on this river.
A．is ever built
B．has ever been built
C．was ever built
D．has ever built
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