We (say) ______ enough on how to learn a foreign language. have said此题空格处要求用动词的完

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问题 We (say) ______ enough on how to learn a foreign language.

选项

答案 have said

解析此题空格处要求用动词的完成时形式，表示已经结束的动作，并对现在产生影响。句意：关于如何学好一门外语，我们已经说得够多的了。

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