一道英语选择题,答案已经知道,我不懂Americans like to travel by bus because it's safer than __going_____by car.为什么填going?

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一道英语选择题,答案已经知道,我不懂Americans like to travel by bus because it's safer than __going_____by car.为什么填going?
一道英语选择题,答案已经知道,我不懂
Americans like to travel by bus because it's safer than __going_____by car.
为什么填going?

一道英语选择题,答案已经知道,我不懂Americans like to travel by bus because it's safer than __going_____by car.为什么填going?
介词后加动词ing形式,than是介词