单项选择题

He had always kept a ___________ eye on what was happening around him.

A．clear
B．keen
C．distinct
D．sensitive
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单项选择题
She says he works hard, and ___________.
A．so he does
B．so does he
C．does he so
D．he so does
单项选择题
A．no matter how it costsB．however much it costsC．how much does it costD．however does it cost much
A．no matter how it costs
B．however much it costs
C．how much does it cost
D．however does it cost much
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