问题
单项选择题
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
答案
参考答案：C
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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
参考答案：C