Sarah is badly ill.She *** see a doctor at once

Sarah is badly ill.She *** see a doctor at once

题目
Sarah is badly ill.She *** see a doctor at once
答案
答案1.Sarah is badly ill.She 【needs to】 see a doctor at once
答案2.Sarah is badly ill.She 【need】 see a doctor at once
答案3.Sarah is badly ill.She 【has to】see a doctor at once
答案4.Sarah is badly ill.She 【should】see a doctor at once
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