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clever as he is, ___he doesn't work hard enough to pass the

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clever as he is, ___he doesn't work hard enough to pass the test.
A but B however C so D yet
clever as he is, ___he doesn't work hard enough to pass the
这时由as引导的让步状语从句,但是此句有though的含义,所以后面就不应该有but;however作副词时前后都应该有逗号,做连词时不能直接引导一个完整句子;此举是转折之意,不该用so;所以选D,yet.