18. _________ water to grow is well-known.

 A. That trees need      B. These trees need

 C. That tree needs      D. Trees need

A


解析:

 選A。本句的意思是：樹需要水生長是眾所周知的。

That trees need water to grow是一個(gè)主語從句，放在句子的開頭，引導(dǎo)詞that不能省略。

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