单项选择题

Contact your doctor if the cough persists.

A．insists
B．perseveres
C．continues
D．resists
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单项选择题
Their interpretation was faulty.
A．wrong
B．ambiguous
C．unclear
D．unbelievable
单项选择题
He achieved success through hard work.
A．reached
B．reaped
C．attained
D．took
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