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
3个回答
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The phone rang when Iwas watching TV.对when I was watching TV