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

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 D项congregate“聚集”，根据空格处的意思：舌头后面是食物残渣和细菌聚集处，故选D。A项flourish“繁荣”；B项collaborate“合作”；C项embark“着手”，均不符合题意。
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