单项选择题

China started its nuclear power industry only in recent years, and should ______ no time in catching up.

A．delay
B．lose
C．lag
D．lessen
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单项选择题
Your advice would be ______ valuable to him, who is at present at his wit's end.
A．exceedingly
B．excessively
C．extensively
D．exclusively
单项选择题
Many of the students have a grasp of the main structures, a reasonable vocabulary and a(n) ______ idea of how to pronounce most words they come across.
A．faint
B．vague
C．obscure
D．rough
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