Mr. Brown doesn’t think that all bad languages should be allowed. In his opinion

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问题 Mr. Brown doesn’t think that all bad languages should be allowed. In his opinion, there are ______ that should be kept up.

选项 A、degrees
B、standards
C、levels
D、limits

答案 B

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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