单选题
1.00分
William found it increasingly difficult to read, for his eyesight was beginning to ___________
参考答案: C
参考解析: 句意为William发现读书越来越困难，因为他的视力在衰退。fail此处意为“衰弱，衰退”，其他选项没有此意。故选C项。
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