单项选择题

The old man does exercise every day to keep ______.

A. health
B. healthy
C. healthily
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单项选择题
Your oral English is so good. You ______ it a lot before.
A. must practice
B. must have practiced
C. should have practiced
单项选择题
I knew he wouldn't listen to me, but I kept on ______ to him.
A. talk
B. talking
C. to talk
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