Question

【题目】They didn't know ________.

A. where go to B. where to go C. go to where D. to go where

Answer 1

【答案】B

【解析】句意：他们不知道去哪里。where疑问副词，既可以引导特殊疑问句，也可以跟动词不定式。to go是动词go的不定式形式。故选：B。