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While watching television, ________.    
A．the doorbell rangB．the doorbell was rung
C．we heard the doorbell ringD．we heard the doorbell rings
C

這題考察分詞做狀語的用法，當(dāng)主從句主語一致時，可以省略主句中的主語可be動詞，這題的從句中就省略了主語和be動詞，說明主句的主語也是watch的發(fā)出者，只能選C。因?yàn)閔ear sb do。
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