问题
选择题
While watching television, ______. [ ]
A. the doorbell rang
B. the doorbell rings
C. we heard the doorbell ring
D. we heard the doorbell rings
答案
答案：C
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While watching television, ______. [ ]
A. the doorbell rang
B. the doorbell rings
C. we heard the doorbell ring
D. we heard the doorbell rings
答案：C