单项选择题

Is ______ necessary to complete the design before the National Day

A．this
B．it
C．that
D．such
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单项选择题
If we can ______ our present difficulties, then everything should be all right.
A．get away
B．get off
C．get over
D．get on
单项选择题
China has hundreds of islands, ______ is Taiwan.
A．the largest of which
B．the largest of them
C．the largest of that
D．of them the largest
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