是固搭
疑问词+to do=疑问词+主语+can（或could 注意不能是其他情态动词）
即 等于这个疑问词所引导的宾语从句
I do not know what to reply .请问为什么what 后面要加一个to ,是词组,还是什么语法,
2个回答
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