I hate traveling by air you usually have to wait for hours before the plane takes off. A.

问题补充：

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

答案：

(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。

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