Bejing Daxing International Airport completed its first flight of passenger planes ___________four aircrafts landed saf

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1. (2019高二下·淮安期末) Bejing Daxing International Airport completed its first flight of passenger planes ___________four aircrafts landed safely on the runway Monday morning.

A . though B . as C . while D . before

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江苏省淮安市2018-2019学年高二下学期英语期末考试试卷