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

非謂語動詞作狀語的用法。根據(jù)前半句的While watching television推斷主語必須是“觀看電視”這動作的發(fā)出者，即we；同時主句有have sb. do sth.的句型，省略了to的不不定式做賓補。
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