While they were watching TV, their kids ________. (sleep) ...

★ Past Simple vs Past Continuous

While they were watching TV, their kids ________. (sleep)

A. sleeped

B. slept

C. was sleeping

D. were sleeping

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We use past continuos.

A. For an action that happened in a concrete moment of the past.

B. For an action that was happening during a time in the past.

C. For an action that will happen in the past.

D. non of the these ones.