I sooner but I didn’t know that they were waiting for me.A. had comeB. was comingC. would

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A. had e
B. was ing
C. would e
(答案→)D. would have e
解析：虚拟语气题。情态动词+have done 表示对过去的假设，我不知道他们在等我否则我会早些到的。根据didn’t know可知说的是过去，所以选D。