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【题目】Not only has aspirin proved________for reducing fever and helping stop pain,but there are also other things that aspirin can help with.

【答案】vital

【解析】考查形容词。句意:结果证明是阿司匹林不仅对退烧和镇痛极为重要,而且对其他病症也有辅助作用。“证明是系动词,系动词后填形容词根据句意得知是“重要的意思因此填vital。

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