The______in teeth is mostly caused by eating too much sugar, which causes decay.

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问题 The______in teeth is mostly caused by eating too much sugar, which causes decay.

选项 A、cave
B、vacancy
C、cavity
D、cavern

答案 C

解析名词辨析题。cave意为“洞穴，山洞，崖洞”；vacancy意为“空缺”；cavity意为“(牙齿的)蛀洞”；cavern意为“大洞穴”。根据句意可知，C正确。

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