单项选择题

The business of doctors is to prevent and ______ disease.

A．kill
B．cure
C．wound
D．injure
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单项选择题
______explain it to him, he still didn't understand.
A．Hard as I tried to
B．As I tried hard to
C．Hard I tried to
D．Tried as I hard to
单项选择题
She is always ______ of others.
A．considered
B．considerate
C．considering
D．considerable
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