while watching tv,___a.the doorbell rang b.we heard the door

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while watching tv,___a.the doorbell rang b.we heard the doorbell ring c.we heard
为什么选B啊?如果是D,那前面应该怎么说?为什么不是A呢?
c.we heard the doorbell rings d.we heard the doorbell rang

while+v.ing的形式仅限于主句与从句的主语一致,watching TV的主语是we,主句的主语也应该是we
hear的用法是hear v.或hear v.ing
所以C D都不对

while watching tv,___a.the doorbell rang b.we heard the door 请问while watching TV,we heard the doorbell ring.ring为什么不能加S啊? 英语翻译①While watching television,we heard the doorbell 【rings】 while watching television,__________ A we heard the doorbell While watching TV,__________.A.the telephone rang.B.I heard While watching TV,----- A the doorbell ring B the doorbell r while watching television,_______.1 the doorbell rang 2 we h While watching television,we heard the doorbell ring.为什么不是ri While we are watching TV,the door bell rings.能不能把后半句改成the do i was watching tv when i heard the door(knocking) We were watching TV when the telephone rang. 里的 a.We were watching TV when we heard the door____