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

题型：单选题题类：模拟题难易度：普通

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

A、do B、am doing C、did D、was doing

举一反三

—Sorry, Grace. I I Am A Singer when the phone rang.

— I'm not sure. Maybe when I _______ my dog in the park.

—Sorry I ____ an interesting book called Three Body Problemat that time yesterday.

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