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
He achieved success through hard work.
A．reached
B．reaped
C．attained
D．took
单项选择题
Society is now much more diverse than ever before.
A．colorful
B．attractive
C．flexible
D．varied
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