I hate travelling by air__________ you usually have to wait for hours before the plane takes off.
A．becauseB．thoughC．untilD．unless
A
because因為；though 雖然，盡管；until直到；unless除非，如果不。句意：我討厭乘飛機旅行，因為在飛機起飛前你必須等上幾個小時。結合語境可知選A。
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