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Ответ:

a. ...I was sleeping

b. ..., my teacher was explaining the rule.

c. ..I was going shopping.

d. My parents were discussing something while I was eating breakfast.

e. I was entering the classroom when the lesson began.

f. Yesterday at noon I was walking my dog.

g. Exactly five minutes ago, I was knocking at the door of my flat.

Объяснение: