题目内容

While watching television, __________.
A．the doorbell rang B．the doorbell rings
C．we heard the doorbell ringD．we heard the doorbell rings
C

非谓语动词作状语的用法。根据前半句的While watching television推断主语必须是“观看电视”这动作的发出者，即we；同时主句有have sb. do sth.的句型，省略了to的不不定式做宾补。
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