问题
选择题
Bad weather prevented the work ____ in time. [ ]
A. completed
B. from completing
C. to be completed
D. being completed
答案
答案：D
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Bad weather prevented the work ____ in time. [ ]
A. completed
B. from completing
C. to be completed
D. being completed
答案：D
北京奥运会为确保“水立方”的水质达到国际泳联最新卫生标准，泳池的水将采用砂滤→臭氧→活性炭净水工艺进行处理，其中砂滤、臭氧、活性炭的作用分别是（ ）
| A．过滤、消毒、吸附 | |
| B．吸附、消毒、过滤
| C．过滤、漂白、吸附.m |
| D．杀菌、漂白、吸附 |
