Question

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

Answer 1

A

试题分析：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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