Regular brushing and flossing are the most important weapons in the form of plaq

游客2025-01-20 24

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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Itwasnowclearthatnosuchweaponsweremanufacturedandnonebeenfound.A、wa