All ______is a continuous supply of electric power.

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问题 All ______is a continuous supply of electric power.

选项 A、that is needed
B、what is needed
C、which is most important
D、for our needs

答案A

解析 本题考点为定语从句中关系代词的用法。在定语从句中,当先行词是all, something, nothing等不定代词;或先行词前有first,last,only,few,much, some,any,no等词修饰时;或先行词前有形容词最高级修饰时,一般只用that,而不用which来引导。例如:All that glitters is not gold. All that I want is peace and quiet.
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