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Have a care what you say ______ you may regeret.
A.or                B. and          C. however          but
A

試題分析：考查固定句型：祈使句+and/or + 簡單句，句意：當心你說的話，否則你會后悔的。選A。
點評：固定句型的考查很簡單，要清楚記住結構和用法特點，還有變化形式，這個句型還可以變成：名詞+and/or+簡單句。
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