【題目】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:他不知道他應該選那本書。which book he should choose是賓語從句,從句的主語與主句的主語都是he,所以從句可以改為“疑問詞+不定式”形式,所以答案是to choose。

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