单项选择题

He was rather vague about the reasons why he never finished school．（）

A．bad
B．bright
C．unclear
D．general

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单项选择题
Your dog needs at least 20 minutes of vigorous exercise every day．（）

A．physical
B．energetic
C．regular
D．free
单项选择题
Regular visits from a social worker can be of immense value to old people living alone．（）

A．equal
B．moderate
C．immediate
D．great
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