【题目】The whole nation is struggling to work out an inexpensive ______ effective solution to smog.
A. yetB. stillC. orD. though
在线课程【答案】A
【解析】
考查连词辨析。句意：全国上下都在努力寻找一种便宜，然而却有效的雾霾解决方案。A. yet然而；B. still仍然；C. or或者；D. though尽管，根据题意，故选A。
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