11.He must have had an accident,or he _____ then.

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11.He must have had an accident,or he _____ then.
A) would have been here B) had to be here
C) should be here D) would be here
12.It was essential that the application forms ______ back before the deadline (截止日期).
A) must be sent B) would be sent C) be sent D) were sent
13.We ______ our breakfast when an old man came to the door.
A) just have had B) have just had C) just had D) had just had
14.The rain was heavy and _____ the land was flooded.
A) consequently B) continuously C) constantly D) consistently
15.The children went there to watch the iron tower ______.
A) to erect B) be erected C) erecting D) being erected
How to choose,translate and why?Thanks.

11.A,他一定是出事了,否则他应该在这里.（虚拟语气）
12.D,申请表必须在截止日期之前寄回,这一点很重要.（过去发生的事情用过去时）
13.D,当那位老人来到门口时我们刚吃完早餐.（过去完成时）
14.A,雨非常大以至于土地被淹.（因果关系）
15.D,孩子们去看铁塔被竖起.（动名词）

He must have had an accident,or he _A_ then. 1.He must have had an accident ,or ___ then. He must have had an accident,or he____________ here then 7.He must have had an accident,or he ____ then. He must have an accident,or he ( ) here then. 23、 He must have had an accident,or he___ here then. he must have an accident,or he ()here then.应该填什么? he must have had an accident,or he should have been here the translate please :He must have had an accident,or he would h Tom had(have)an accident when he was walking home . He had an accident yesterday.An accident ---him yesterday The driver might have had an accident but that he __ the car