He found it increasingly difficult to read. his eyesight was beginning to fail.A
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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
试题答案
【答案】
【解析】B
解析 句意为：他发现读书越来越困难，因为他的视力开始下降。for表示原因，符合句意。