单项选择题

As a public relations officer, he is said （） some very influential people.

A. to know
B. to be knowing
C. to have been knowing
D. to have known

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Young people often feel an urge to try （） before the age set by law.

A. a smoking
B. smoke
C. to smoke
D. smoking
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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