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

A. and

B. for

C. but

D. or

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

   A. and            B. for               C. but             D. or

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

A. and 　　　 B. for 　　　　C. but 　　　 D. or

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

A.and           B.for           C.but           D.or

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

       A．and                 B．for                  C．but                  D．or