________ it was blowing hard, ________ went on working in the fields．A.Though; but theyB.Whenever; and yet theyC.While; and theyD.Though; they
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D解析该题考查连接词though与but的用法，根据英语结构的要求，主从句只能用一个连接词，这与汉语不同．如汉语可说：尽管风很大，但是他们还在田里继续劳动．而英语则不说：Though it was blowing hard, but they went on working in the fields．故A、B、C均不合要求．但though可与yet, still等连用．