问题: 动词时态一道单选题
--Tom, did Mr.Li join you in your discussion?
--No, he ________, but he happened to have fallen ill.
A. would like to
B. will
C. was to have
D. was going to join
答案给的C，请问其中这个have如何理解
解答:
我觉得was to have done应该是跟should have done同义吧~~？？表本该做的事却没做~~~but后面是指原因~~
have后面省略了join in your discussion
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