单项选择题

Only when he thought himself unobserved could one ______ the underlying melancholy and frustration.

A．recognize
B．discriminate
C．reveal
D．discern
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单项选择题
As it was, the Democrats would control the federal government ______ because of the division among their opponents.
A．mostly
B．generally
C．chiefly
D．largely
单项选择题
The noise of the truck died ______ in the distance.
A．away
B．off
C．out
D．down
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