单项选择题

I am ______ of his chances of passing the examination because he has not worked hard enough.

A．ambiguous
B．ambitious
C．dubious
D．rational
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单项选择题
The new law will only have a ______ effect on the lives of most people.
A．nominal
B．marginal
C．skeptical
D．medieval
单项选择题
Wolves were ______ mournfully in the nearby forest at night.
A．groaning
B．howling
C．barking
D．roaring
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