While writing a letter, _____. [ ]A. the door bell rang B. the door bell rings C. I heard the door b
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题目简介
While writing a letter, _____. [ ]A. the door bell rang B. the door bell rings C. I heard the door b
题目详情
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B. the door bell rings
C. I heard the door bell ring
D. I heard the door bell rings
答案