没有正确的选项呀,正确的应该是：What ( were ) the twins( doing ) when it rained?可以告诉我什么原因吗？因为when 后的时态是一般过去时，意思‘当一个动词发生的时候，另一个动作正在进行’，故主句用过去进行时。Mr Green saw the accident ___in the street the day before yesterday.A,happen B,happens C,happened D,to happen并解释一下原因好吗？A （ 固定用法：see sb/ sth do sth ;see sb/sth doing sth )I went to bed at elevern o'clock last night , but my mother _____at her desk A,still was working B,was still working C,still worked D,worked still解释一下原因！thank youB ( 根据at elevern o'clock last night ‘昨晚11点钟的时候’，妈妈还在工作）该采纳了吧？