In our city, citizens have free to the library, which makes it easy for them to read any

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A. time
B. entrance
C. charge
(答案→)D. access
解析：考查固定句型，free access to意思“……自由入口”，句子意思“在我们城市，居民可以自由出入图书馆，这使他们读到自己喜欢的书很容易”，free time意思“空闲时间”，free entrance意思“免费入场”，free charge意思“免费”，所以选D