2. 外语
  3. Regular brushing and flossing are the most important weapons in the form of plaque, the primary cause of cavities.

Regular brushing and flossing are the most important weapons in the form of plaque, the primary cause of cavities.

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问题 Regular brushing and flossing are the most important weapons in the form of plaque, the primary cause of cavities.
选项 A、on the formation
B、about the formation
C、for forming
D、against the formation
答案D
解析
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