While watching television, ______.

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问题 While watching television, ______.

选项 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 非谓语动词。首先while引导的非谓语watching的主语应为人,因此排除A、B。又因为hear为感官动词,hear sb. do sth. ,因此ring应为原形,故选C。
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