They were doing their homework when I came in.改( 为否定句) They _ _ theirThey were doing their homework when I came in.改（ 为否定句） They _ _ their homework when I ___ in.
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They were doing their homework when I came in.改( 为否定句) They _ _ their
They were doing their homework when I came in.改（ 为否定句） They _ _ their homework when I ___ in.
They( weren't )(doing ) their homework when I (came ) in.