He must have had an accident,or he _A_ then.A would have been here B had to be here C should be here D would be here为什么?
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![He must have had an accident,or he _A_ then.A would have been here B had to be here C should be here D would be here为什么?](/uploads/image/z/7453302-6-2.jpg?t=He+must+have+had+an+accident%2Cor+he+_A_+then.A+would+have+been+here+B+had+to+be+here+C+should+be+here+D+would+be+here%E4%B8%BA%E4%BB%80%E4%B9%88%3F)
He must have had an accident,or he _A_ then.A would have been here B had to be here C should be here D would be here为什么?
He must have had an accident,or he _A_ then.
A would have been here B had to be here
C should be here D would be here
为什么?
He must have had an accident,or he _A_ then.A would have been here B had to be here C should be here D would be here为什么?
A,表虚拟现实,如果不是这样(车祸)的话,他应该在那里的!
虚拟语气的。 前面是过去完成时的推测、 后面也应该用过去完成将来时 、 OK
A
要用have,应为是过去时