The lake is calm and clear, and one of the things that in the water is the famous tower.A.

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A. reflects
B. reflect
C. is reflected
(答案→)D. are reflected
解析：该题结合定语从句考查动词的语态和主谓一致的用法。该句中的定语从句先行词的中心词是the things，从句引导词that在句中作主语，因此排除选项A、C；根据the things与reflect之间是被动关系，所以本题最佳答案是B。