All ______ is needed is a supply of oil.

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问题 All ______ is needed is a supply of oil.

选项 A、the thing
B、that
C、what
D、which

答案B

解析 本题有两个不是并列关系的谓语动词,其中肯定有一个是从句的谓语。据题意可知,主语all带有一个定语从句。先行词为不定代问all时,关系代词要用 that,不用which,故选B。what不能引导定语从句,只能引导名词性从句。这句若无all,则要用what。
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