While watching TV,____. [ ]A. the door bell rang. B. the door bell rings. C. we heard the door bell
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题目简介
While watching TV,____. [ ]A. the door bell rang. B. the door bell rings. C. we heard the door bell
题目详情
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B. the door bell rings.
C. we heard the door bell ring.
D. we heard the door bell rings.
答案