单项选择题

By the year 2000, production in the area is to double ______ of 1990.

A．that
B．it
C．one
D．what
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If you have really been studying English for so long, it' s about time you __ able to write letters in English.
A．should be
B．were
C．must be
D．are
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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