He found it increasingly difficult to read, ______ his eyesight was beginning to

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问题 He found it increasingly difficult to read, ______ his eyesight was beginning to fail.

选项 A、and
B、for
C、but
D、or

答案 B

解析 for是并列连词，引导并列分句，意为“因为”，表示附加的理由，是推测或判断的理由。and表示两句之间是并列关系。but意为“但，但是，可是，然而”，表示两个句子是转折关系。or表示两句之间是选择关系。

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