I sooner but I didn't know that they were waiting for me.A. had come B. was comingC. woul

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A. had e
B. was ing
C. would e
(答案→)D. would have e
解析：选D　考查虚拟语气。句意：我本来可以早来，但是我不知道他们在等我。换句话说，如果我知道他们在等我，我就会早来。此处虚拟条件通过but暗示出来，模式为“虚拟情况＋but＋真实情况”。