单项选择题

The problem has ______simply because you didn't follow my instructions.

A．raised
B．aroused
C．risen
D．arisen
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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
单项选择题
Silver is the best conductor of electricity, copper______it closely.
A．followed
B．following
C．to follow
D．being followed
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