We had trouble finding a pure water supply.A typical B complete C clear D clean

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问题 We had trouble finding a pure water supply.

选项 A typical
B complete
C clear
D clean

答案D

解析pure 的意思是“纯净的”,如:pure gold (纯金),pure wool (纯羊毛)。pure water 的意思是“纯净水”,故可用dean来替代。dear的意思是“清楚、清澈”,并非是“清洁的”。
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