He found it increasingly difficult to read, _____his eyesight was beginning to fail.

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问题 He found it increasingly difficult to read, _____his eyesight was beginning to fail.

选项 A、though
B、for
C、but
D、so

答案B

解析 考查连词。“他发现读书逐渐变得困难,因为他的视力在下降”,应该用for表示原因,其它选项没有“因为”的意思。
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