Question

I hate travelling 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

because因为；though 虽然，尽管；until直到；unless除非，如果不。句意：我讨厌乘飞机旅行，因为在飞机起飞前你必须等上几个小时。结合语境可知选A。