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Sung-joon has been in the army （）two years

A. since
B. ago
C. once
D. for

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My mother and father （）for a new house at that time

A. look
B. were looking
C. would look
D. looked

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Sarah （）the laundry when Nick stopped by to say hello

A. was doing
B. had done
C. does
D. has done

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