an awful accident did however occurred the other day病句修改

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• An awful accident_____,however,happen the other day.A.does B.did C.has to D.had to答案是B,为什么?我没弄懂它的句型是什么
• A terrible accident____,however,occur the other day and weA terrible accident _______,however,occur the other day and we witnessed it _______ accident.A.does;byB.did;byC.has to;onD.had to;on我知道答案选B,我想问的是前面一个空为什么不能用had to?（我单独问前面一个空,和后面的by accident 无关）
• An awful accident _____,however,occur the other dayA does B did C has to D had to
• an awful accident did however occurred the other day病句修改
• An awful accident（）,however,occur the other day.1 did 2 does 3 has to 4 had to 选哪个,为什么
• An awful accident __,however,occur the other day正确答案是：did,为什么啊,
• 1：_____near the railway station,the Bank of China is easy to find A locating B located C having located D being located为什么?主语是bank 主动呀,为什么不选A?2An awful accident ,however ,_____occur the other day.A dose B did C has to D had to为什么?是什么语法点呀?3Once environmental damage _____,it takes many years for the system to recover.A has done B was doing C dose D is done语法点.For your safety ,at no time ____allow you to take action by yourself .Athe police can B the pol
• An awful accident_____,however,happen the other day.
• an awful accident did however occurred the other day病句修改
• An awful accident _____,however,occur the other day
• 五个数的平均数是87 把找些数从大到小排列 前三个数的平均数是105 后三个数的平均数是什么
• 9格方格阵,使上下左右斜相等,中间数是-7