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He found it increasingly difficult to read, ______ his eyesight was beginning to fail.
A. though         B. for        C. but          D so
B
这是一个原因连词。原因连词for表示的原因并不说明主句行为发生的直接原因,只是提供一些有利于说明情况的补充说明, 且不可位于主句前。
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