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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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【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。