He found it increasingly difficult to read, ______ his eyesight was beginning to fail.
A．thoughB．forC．butD．so
B
句意為：他發(fā)現(xiàn)閱讀逐漸地困難起來(lái)，因?yàn)樗囊暳﹂_(kāi)始慢慢下降。A項(xiàng)意為“盡管”，B項(xiàng)為“因?yàn)�，由于”，表明附加或推斷的理由，引�?dǎo)的分句前常有逗號(hào)，for分句一般不放于句首。But表示轉(zhuǎn)折，so表示“因此”。根據(jù)句意可以知道，后面一句話是用來(lái)解釋說(shuō)明前一句的，所以用B項(xiàng)最佳。
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