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There are a number of organizations and books that can help you learn more about
There are a number of organizations and books that can help you learn more about
游客
2024-01-02
71
管理
问题
There are a number of organizations and books that can help you learn more about ______indoor air quality.
选项
A、to improve
B、how to improve
C、improve the
D、how improve
答案
B
解析
The infinitive phrase how to improve is the object of the preposition about.
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