单项选择题

Mary saw her son ______ the piano when she came to the room.()

A. playing
B. play
C. played
D. to play

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Where is Mr. Liu You can find him whether in library or ______ home. ()

A. in
B. at
C. from
D. with

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One day I ______ a newspaper article about the retirement of an English professor at a state college.()

A. came across
B. came about
C. came after
D. came at

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