单项选择题

He ______ at the boy into silence.

A．glanced
B．observed
C．watched
D．stared
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单项选择题
Many a young scientist ______ engaged in the research work.
A．have
B．has
C．have been
D．has been
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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