Brushing removes larger particles, but dentists suggest brushing the back of the tongue as well, where food residues and bacteri

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问题 Brushing removes larger particles, but dentists suggest brushing the back of the tongue as well, where food residues and bacteria ______.

选项 A、flourish
B、collaborate
C、embark
D、congregate

答案D

解析 congregate聚集;flourish繁荣;collaborate合作;embark着手。
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