Using bicycles ______ greatly to people’s physical fitness as well as easing traffic jams.

A. substitutes    B. attributes     C. distributes     D. contributes

D


解析:

contribute to固定搭配，意為“促成，有助于”。句意為：使用自行車有助于人們的身體健康，并極大地緩解了交通阻塞。substitute意為“代替”；attribute意為“歸于，屬于”；distribute意為“分配，散布”。

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