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(2013·宁夏银川一中高三第四次考试)________ scores of times, but he still couldn't understand it.
A.Having explained
B.Having been explained
C.Though it was explained
D.It was explained
D
D 考查句子结构。本句中的but是并列连词,由此可知but前后都是完整的分句。表转折意义的句中,but与though不能同时用,故D项正确。
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