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

A. though
B. for
C. but
D. so
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科目：高中英語 來源：山東省高考真題 題型：單選題

He found it increasingly difficult, _____ his eyesight was beginning to fail.
[     ]
A. though
B. for
C. but
D. so

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