Dentists suggest brushing teeth at least twice a day to______them from decaying.

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问题 Dentists suggest brushing teeth at least twice a day to______them from decaying.

选项 A、deny
B、protect
C、pretend
D、differ

答案B

解析 deny：否认，拒绝；protect：保护，protect…from…是固定搭配，意为“保护……免受……”；pretend：假装；differ：不同。根据句意可知，选B。

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