While writing a letter, _____.

A. the door bell rang
B. the door bell rings
C. I heard the door bell ring
D. I heard the door bell rings
C
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科目：高中英語(yǔ) 來(lái)源：浙江省期中題 題型：單選題

While writing a letter, _____.

[     ]

A. the door bell rang
B. the door bell rings
C. I heard the door bell ring
D. I heard the door bell rings

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