单项选择题

That matter is so ______ that it must not be discussed outside his office.

A．confidential
B．confident
C．private
D．mysterious
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单项选择题
The ______ estimate of gains in gross national product suggested a fast recovery from economic recession.
A．introductory
B．possible
C．primary
D．preliminary
单项选择题
Mr. Bussell is a good teacher, but he often gives ______ lectures.
A．excellent
B．sound
C．extensive
D．tedious
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