单项选择题

We expressed the hope ______ Mr. and Mrs. Smith would come to visit China again sometime next year.

A．that
B．whether
C．when
D．which
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单项选择题
China has hundreds of islands, ______ is Taiwan.
A．the largest of which
B．the largest of that
C．the largest of them
D．of them the largest
单项选择题
Is ______ necessary to complete the design before the National Day
A．this
B．that
C．it
D．such
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