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—What were you doing this time yesterday?

—I ____　 on the grass and drawing a picture.

A. sit　 B. sat　 C. am sitting　 D. was sitting

----What were you doing this time yesterday?
----I ________ my homework at John’s house.

----What were you doing this time yesterday?

----I ________ my homework at John’s house.

A．do               B．a(chǎn)m doing          C．did              D．was doing

—What were you doing this time yesterday?

—I _______ some cleaning at home.