All______is a steady supply of water to the farmland.

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问题 All______is a steady supply of water to the farmland.

选项 A、which needs
B、that is needed
C、the thing is needed
D、need

答案B

解析 句子的大意为:所需要的就是对农田用水的稳定供应。本句主语为不定代词all,“that is needed”为主语的定语从句。所以B项符合题意。
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