While doing my homework, . A. I heard the doorbell ring B. the doorbe——青夏教育精英家教网—

摘要： While doing my homework, . A. I heard the doorbell ring B. the doorbell rang C. my mother came in D. my mother was cooking

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While doing my homework, ______________.

A. I heard the doorbell ring B. the doorbell rang

C. my mother came in D. my mother was cooking

While doing my homework，________.

A．I heard the doorbell ring

B．the doorbell rang

C．my mother came in

D．my mother was cooking

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