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  3. Brushing removes larger particles, but dentists suggest brushing the back of the

Brushing removes larger particles, but dentists suggest brushing the back of the

游客2025-04-25  1
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”，如A crowd quickly congregated round the speaker(大群的人迅速地在演说者周围聚集起来)，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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