题目：阅读下文，回答21——35小题 We were late as usual. My husband had ( 21 )watering the flowers in the garden by himself, and when he discovered that he couldn't manage , he asked me for ( 22 ) at the last moment. So now we had only one hour to get to the airport. Luckily, there were not many cars ( 23 ) buses on the road and we were ( 24 ) to get there just in time.We checked in and went straight to a big hall to wait for our flight to be called. We waited and waited ( 25 ) no announcement was made. We asked for ( 26 ) and the girl there told us the plane hadn't even arrived yet. In the end, there came an announcement telling us that those ( 27 ) for flight No.108 could get a free meal voucher and that the plane hadn ’t left Spain ( 28 ) technical problems.We thought that meant ( 29 ) it wasn't safe for the plane to ( 30 ). We waited again for a long time until late evening when we were asked to report again.This time we were （ 31） free vouchers to spend the night in a nearby hotel.The next morning after a （ 32 ） night because of all the planes taking off and landing, we were reported back to the airport.Guess （ 33 ） had happened while we were asleep. Our plane had arrived and taken off again, All the other （ 34 ） had been waken up in the night to catch the plane, but for some reasons or other we had been （ 35 ） .You can imagine how we felt !
A. when
B. which
C. what
D. that
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