2. 外语
  3. There are a number of organizations and books that can help you learn more about ______indoor air quality.

There are a number of organizations and books that can help you learn more about ______indoor air quality.

admin2019-07-01  45
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.
转载请注明原文地址:https://www.kaotiyun.com/show/b4fO777K
0

托福（TOEFL）

相关试题推荐
随机试题
最新回复(0)