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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单项选择题
It is so heavy that it can only be lifted with our () effort.

A. joint
B. equal
C. able
D. capable
单项选择题
The plan had been (), which made him very angry.

A. called off
B. called up
C. called in
D. called on
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