I hate traveling by air you usually have to wait for hours before the plane takes off.
A. because
B. though
C. until
D. unless
网友回答
(答案→)A. because
B. though
C. until
D. unless
解析:句意:我讨厌乘飞机旅行,因为你通常要在飞机起飞前等好几个小时。A.because 因为; B.though 尽管,虽然;C.until直到……时候;D.unless除非。因为等时间所以讨厌乘飞机,这是因果关系,故选A。