2. 外语
  3. The Safe Drinking Water Act requires that municipal tap water ______for more than 80 contaminants.

The Safe Drinking Water Act requires that municipal tap water ______for more than 80 contaminants.

admin2012-10-20  55
问题 The Safe Drinking Water Act requires that municipal tap water ______for more than 80 contaminants.
选项 A、ought to be screened
B、be screened
C、need be screened
D、is to be screened
答案B
解析
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