题目内容
Mr. Barret doesn’t think that all bad language should be allowed. In his opinion, there are ______ that should be kept up.
A. degrees B. levels C. limits D. standards
D
解析:
Mr. Barret 认为并非所有不标准的语言都可以使用.哪些可用，哪些不可用，应有一定的标准.故选D.
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