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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