______did he go to the hospital______？He went to the hospital to have a checkup on eyesight．A.What，／B.Why，forC.What，forD.What，to
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C
解析分析：此处是对表示“目的”的动词不定式短语to have a checkup on eyesight提问。对“目的”状语提问，不管是动词不定式，从句，还是for+名词，都可以用what…for？的方式，也可以转换为原因，用why来提问。(延伸)What did he go to the hospital for？＝Why did he go to the hospital？