While watching television, . A. the doorbell rang B. the doorbell rings C. we heard the doorbell ring D. we heard the doorbell rings 题目和参考答案——青夏教育精英家教网—

题目内容

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
解析：

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