单项选择题

(The atmosphere) (is consisted) of certain gases (mixed together) (in) definite proportions.

A．The atmosphere
B．is consisted
C．mixed together
D．in
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单项选择题
John suggested ______ anything about it until they found out more facts.
A．not to say
B．not say
C．to say not
D．not saying
单项选择题
The real trouble ______ their lack of confidence in their abilities.
A．lies in
B．lies on
C．results in
D．leads to
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