单项选择题

He's______ as a" bellyacher" -- he' s always complaining about something.

A．who is known
B．whom is known
C．what is known
D．which is known
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单项选择题
The problem has ______simply because you didn't follow my instructions.
A．raised
B．aroused
C．risen
D．arisen
单项选择题
The higher the standard of living and the greater the national wealth, ______
A．the greater amount of paper is used
B．the greater is the amount of paper is used
C．the greater the amount of paper used
D．the amount of paper is used is greater
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