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单选题
为避免污染，必须在非常清洁的环境里执行该任务。
A
Because of the risk of contamination, you must do this task in a very clean environment.
B
To prevent environmental pollution, this task must be done in a very clean area.
C
In order to prevent contamination, the task you must do is to find a very clean environment.
答案解析
正确答案：A
相关知识点：
防污染须在清洁环境做任务
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