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
A doctor should examine the patient to ______ where the pain is localized.
A．alienate
B．alternate
C．allocate
D．ascertain
单项选择题
She then instructed her subjects to ______ these postures as precisely as possible.
A．illuminate
B．lubricate
C．duplicate
D．emigrate
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