You can fly to London this evening ______you don’t mind changing

You can fly to London this evening ______you don’t mind changing planes in Paris.
A、unless
B、except
C、so far as
D、provided
【正确答案】：D
【题目解析】：if = provided 表示如果句意：如果你不介意在巴黎换机，你今晚就可以飞往伦敦。