关于happen的选择题 （ ）选哪个?权威点 ,说明理由!（）Did you see the traffic accident yesterday?Yes,I saw it_____when I_____past the school gate.A.happen；walk B.happen；was walking C.happened；walking D.happening；have walked

关于happen的选择题 （ ）选哪个?权威点 ,说明理由!（）Did you see the traffic accident yesterday?Yes,I saw it_____when I_____past the school gate.A.happen；walk B.happen；was walking C.happened；walking D.happening；have walked 高一一道关于函数的数学选择题 求解!选哪个 给出过程 关于NaCl溶液配置的一道选择题 应该选哪个 为什么 C.was happen D.happens 选哪个 关于happen的英语选择题I was out of town at that time,so I didn't know exactly how it __________.A.happenB.had happenedC.happensD.has happened我选了B,但是我觉得应该是happened（选项里没有）,求解为什么不是happened walk through 和walk past的区别?哪个及物动词?哪个不及物?A woman saw it ________ when she was walking _________.A.to happen;overB.happen;passedC.happening;throughtD.happen;past选C还是D- - We can not have that sort of thing happen/happened/to happen/happening选哪个? 关于病句的选择题 关于病句的选择题 关于名人传的选择题 关于 名人名言的选择题 关于圆的选择题. fast happen can stand 的a的音标哪个不同 问个关于happen的用法的问题.happen.不是happen to do sth.那么 碰巧去做,碰巧正做,和碰巧已做.是不是分别是happen to do,happen to doing,happen to have been? something happens和something happen哪个是对的啊? 工程力学选择题,选哪个,谢 线性代数选择题,选哪个答案? 第一道选择题选哪个