问题
选择题
While watching TV,____. [ ]
A. the door bell rang.
B. the door bell rings.
C. we heard the door bell ring.
D. we heard the door bell rings.
答案
答案：C
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While watching TV,____. [ ]
A. the door bell rang.
B. the door bell rings.
C. we heard the door bell ring.
D. we heard the door bell rings.
答案：C