单项选择题

It is because English is very useful ______.

A．that we study it hard
B．what we study hard
C．why we study it hard
D．which we study hard
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单项选择题
There ______ that you must keep in mind while dealing with this problem.
A．is one or two points
B．are one or two points
C．is a point or two points
D．are a point and two points
单项选择题
The higher the standard of living and greater the national wealth, the ______.
A．greater is the amount of paper is used
B．greater the amount of paper is used
C．greater amount of paper is used
D．amount of paper is used is greater
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