学帮网How fast__________________________(you/drive)when the accident__________(happen)?
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How fast__________________________(you/drive)when the accident__________(happen)?
were you driving,happened
you were driving, happened
were you driving
happens
were you driving happened
were you driving happened
意思是
事故发生的时候，你的车速是多快？
第一个空表示事故发生的同时的车速，于是用过去进行时
第二个空事故已经发生了，于是用过去式