单项选择题
21()
A.of
B.at
C.for
D.on
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单项选择题
His health______, my father retired from the business last year.
A. fails
B. was failed
C. failing
D. failed
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单项选择题
—Are you feeling______ —Yes, I'm fine now.
A. any well
B. any better
C. quite good
D. quite better
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