问题

lice at Denver International Airportexamined a bomb threat against a United Airlines flight to SanFrancisco,____________ the flight for hours.

A:delayed
B:to delay
C:delaying
D:had delayed

正确答案是：

同类题型

Who a poster in your class

下列文言句式与例句相同的一项是例：而莫之夭阏者

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