Question

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

A.andB.butC.orD.for

Answer 1

【答案】D

【解析】

考查连词辨析。句意：他发现看书越来越费劲，因为他的视力开始变弱。A. and并且；B. but但是；C. or否则；D. for因为。根据句意可知“视力变弱”是“看书越来越费劲”的原因，故D项正确。