单项选择题

Many a young scientist()engaged in the research work.

A. have
B. has
C. have been
D. has been

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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
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
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