Not until most of the people had left the airport（）his sister was there.
A:that he saw
B:had he seen
C:did he see
D:that he had seen
出自：专升本
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Not until most of the people had left the airport（）his sister was there.
A:that he saw
B:had he seen
C:did he see
D:that he had seen
出自：专升本