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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He's______ as a bellyacher -- he' s always complaining about something.
A．who is known
B．whom is known
C．what is known
D．which is known
单项选择题
The problem has ______simply because you didn't follow my instructions.
A．raised
B．aroused
C．risen
D．arisen
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