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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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