he was reading when his mother came back.→He _____ _____reading when his mother _____back home.1)1)改为否定句→_____ he reading when his mother_____back home?(改为疑问句)

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he was reading when his mother came back.→He _____ _____reading when his mother _____back home.1)
1)改为否定句
→_____ he reading when his mother_____back home?(改为疑问句)

was not came
was came

He wasn't reading when his mother came back.
Has he reading when his mother came back?