单选题
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
【正确答案】
C
【答案解析】
[解析] 直到大多数人已经离开机场，他才看到他的妹妹在那儿。
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