I would have come sooner but I ________ that they were waiting.
A．haven’t knownB．hadn’t knownC．don’t knowD．didn’t know
D
因?yàn)閣ould have come是表示與過去事實(shí)相反的虛擬語態(tài)，所以是“我當(dāng)時(shí)不知道他們?cè)诘取薄?/div>
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