单项选择题

He refused the invitation to dinner on the ______ of being too busy.

A．excuse
B．ground
C．plea
D．point
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单项选择题
No one was more ______ than Neil in supporting the proposal.
A．dubious
B．spacious
C．zealous
D．curious
单项选择题
After two years he received the certificate of the college for ______ in chemistry.
A．proficiency
B．diversion
C．immersion
D．involvement
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