单项选择题

Mr. Smith （）working till he was seventy years old.

A. kept up
B. kept on
C. kept to
D. kept out

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I am used（）my sleep interrupted.

A. to have
B. having
C. have
D. to having

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The fact remains （）we are behind many others.

A. that
B. why
C. where
D. how

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