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All is needed is a supply of oil.

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All is needed is a supply of oil.
A.the thing B.that C.what D.which
All is needed is a supply of oil.
答案B 此题all为先行词,后面that is needed为that引导的定语从句,且作从句中的主语,由于all为不定代词,此时关系词不可用which,而what不可引导定语从句;当然,若无all可选C,因为此处的All that=what…,若All the thing为先行词,后面缺乏引导定语从句的关系代词that(且在从句中作主语,不可省略),故A后应加that. 查看原帖