题目

_________ water to grow is well-known.  A. That trees need      B. These trees need  C. That tree needs      D. Trees need 答案：A 解析: 本句的意思是：树需要水生长是众所周知的。 That trees need water to grow是一个主语从句，放在句子的开头，引导词that不能省略。

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