He put his address on the packages so people would know _______ to go if they had questions.

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问题 He put his address on the packages so people would know _______ to go if they had questions.

选项 A、where
B、what
C、which
D、that

答案A

解析 “疑问词+to不定式”有“介词+名词”的性质,可用于主语、宾语和补语。这里省略了引导宾语从句的that,to go的go是不及物动词。后面句子是完整的,所以用疑问副词where最合适。what,which等和“to+及物动词”一样,当后面没有宾语、句子不完整时使用。
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