(2013·寧夏銀川一中高三第四次考試)________ 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　考查句子結(jié)構(gòu)。本句中的but是并列連詞，由此可知but前后都是完整的分句。表轉(zhuǎn)折意義的句中，but與though不能同時用，故D項正確。
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