单选题 While watching television, ______.
A. the telephone rang B. we heard the telephone ring
C. and to play football D. the telephone was rung

【正确答案】 B
【答案解析】前后分句的主语应一致,因此排除A和D;hear后可跟动词原形和现在分词形式,但不能跟过去式。