单项选择题

It is obligatory for employees to follow a carefully ______ program.

A. plan
B. planned
C. planning
D. plans
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单项选择题
They don't have any idea about ______ they have to do all the works by themselves.
A. what
B. where
C. why
D. because
单项选择题
The director explained the jobs done with such ______ that no one found any extra needs to explain more.
A. enthusiastic
B. enthusiastically
C. enthusiasm
D. enthusiast
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