单项选择题

His answers were obscure and confusing.

A．unclear
B．obvious
C．clear
D．direct
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单项选择题
Cement was seldomused in buildings of the Middle Ages.
A．slightly
B．rarely
C．originally
D．occasionally
单项选择题
He denies involvementwith either drugs or the CIA.
A．interference
B．interruption
C．intervention
D．interaction
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