the bus ------,we walked across the street.a.stopped b.stopping c.has stopped d.when it stoppedb stopping,为什么?

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the bus ------,we walked across the street.a.stopped b.stopping c.has stopped d.when it stoppedb stopping,为什么?
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the bus ------,we walked across the street.a.stopped b.stopping c.has stopped d.when it stoppedb stopping,为什么?
the bus ------,we walked across the street.a.stopped b.stopping c.has stopped d.when it stopped
b stopping,为什么?

the bus ------,we walked across the street.a.stopped b.stopping c.has stopped d.when it stoppedb stopping,为什么?
两句话之间用逗号连接,说明是一句话,一句话只能有一个谓语动词,walked是谓语动词,所以前半句用非谓语形式,bus和stop之间是主动关系,所以用Ing形式