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I was ( )him last Wednesday but he didn't come.

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I was ( )him last Wednesday but he didn't come.
A.about to see
B.to see
C.about to have seen
D.to have seen
我选A,但答案选D,为什么选D?如果D可以,那C可以吗?
求翻译句子!
I was ( )him last Wednesday but he didn't come.
I was TO HAVE SEEN him 的意思是,在过去某件事情原本要发生的,但最终没能发生.这时候,你就用be+谓语动词完成式结构.A指的是“将来”.B也是“将来”.C英语中不存在这种结构.
又如:
He was to have left for Germany,but he suddenly fell too ill to move about.