【单选题】Mr. Brown doesn't think that all bad languages should be allowed. In his opinion, there are ______ that should be kept up.
A. degrees
B. standards
C. levels
D. limits
网考网参考答案：B
网考网解析：
keep up意为“维持”。standard意为“标准”；degree意为“程度”；level意为“水平”；limit意为“限制”。由题意可知应选B。
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