12．I must say that you have done very well in your first month here．____，you should know that you still have a lot to learn．（　�。�
A．ButB．HoweverC．ThereforeD．So

分析 考查副詞辨析，句意：我得說，你在這兒的第一個(gè)月做得很好．不過，你應(yīng)該知道，你還有很多東西要學(xué)

解答 答案B，這兩個(gè)句子之間是句號(hào)，不需要連詞，排除A和D選項(xiàng)，根據(jù)句意："我得說，你在這兒的第一個(gè)月做得很好．不過，你應(yīng)該知道，你還有很多東西要學(xué)"，是轉(zhuǎn)折，不是因果．所以選B，

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