While reading a book , . A. the girl came in B. my mother was cooking C. I heard a knock ——青夏教育精英家教网—

摘要：While reading a book , . A. the girl came in B. my mother was cooking C. I heard a knock on the door D. the doorbell rang

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Choose the best answer which can complete the sentence.

While reading a book, ________.

[　　]

A．the girl came in

B．my mother was cooking

C．I heard a knock on the door

D．the doorbell rang

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