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12、_______, he still couldn’t understand what I meant.

       A. However carefully I explained                        B. However I explained carefully

       C. However I careful explained                          D. However careful I explained.

12、D

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_______, he still couldn’t understand what I meant.

       A. However carefully I explained                        B. However I explained carefully

       C. However I careful explained                          D. However careful I explained.

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