【題目】He found it increasingly difficult to read, ________ his eyesight was beginning to fail.

A. though B. for C. but D so

【答案】B

【解析】

試題分析：考查句意理解。句意：他發(fā)現(xiàn)閱讀日益困難起來，因為他的視力開始慢慢下降。A項意為“盡管，雖然”，不符合句意。B項為“因為，由于”，表明附加或推斷的理由，引導(dǎo)的分句前常有逗號，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，后面一句話是用來解釋說明前一句的，所以用B項最佳。故選B。

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