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【题目】He doesn't know which book he should choose.(同上)
He doesn't know which book .

【答案】to;choose
【解析】句意:他不知道他应该选那本书。which book he should choose是宾语从句,从句的主语与主句的主语都是he,所以从句可以改为“疑问词+不定式”形式,所以答案是to choose。

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