一道英语选择题？
Heiswritingabook()hecallsthetripofhislife.AthatBonwhatCinwhichDinwhat答案选B，不过我不是太清楚，请各...
He is writing a book ( ) he calls the trip of his life.
A that
B on what
C in which
D in what
答案选B，不过我不是太清楚，请各位达人帮我分析一下句子结构！ 展开
A that
B on what
C in which
D in what
答案选B，不过我不是太清楚，请各位达人帮我分析一下句子结构！ 展开
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