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

Would you like some ______—Yes, please. I’m hungry.

With the help of high technology, more and more new substances ___in the past few years

I’m very grateful for your help and hopethat someday I may be able to do something for you___．[ ]

I want to know if I smoke here.— No, you . Could you see the sign “NO SMOKING” there?

My mind wasn’t on what he was saying so I’m afraid I______ half of it.