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 doorbell ring c.we heard
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
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
英语人气：180 ℃时间：2020-04-12 19:52:37
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