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单项选择 There are so many books_____ that I don not know which

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单项选择 There are so many books_____ that I don not know which to buy.
A to be chosen B to choose
C for choosing D to choose from
已知正确答案为 清给出理由
单项选择 There are so many books_____ that I don not know which
D to choose from
这是状语从句(从句主语与逻辑主语一致),在此句中,从句主语是I,所以主句的逻辑主语也为I,故要用to choose,即choose这个动作是I发出的,不存在被动.
但是to choose 不定式做定语修饰books就必须加from,因为to choose 为不及物动词词组,books在to choose from这个从句中做宾语,构成介宾关系,from也就限定了choose的范围.