His supposition is good in theory _____ cannot be put into practice.A.andB.orC.butD.while

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His supposition is good in theory _____ cannot be put into practice.A.andB.orC.butD.while
His supposition is good in theory _____ cannot be put into practice.
A.and
B.or
C.but
D.while

His supposition is good in theory _____ cannot be put into practice.A.andB.orC.butD.while
选C,
解析:根据意思,“他的猜想从理论上来说是很不错的,但是很难放到实践中去”故用but,不用别的.

C 解析:这里是转折的意思

很明显 前后是转折关系 要用but

C