Tom had to buy __these CDs because he did not kno w which one to take.填both不行吗?

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Tom had to buy __these CDs  because he did not kno  w which one to take.填both不行吗?

Tom had to buy __these CDs because he did not kno w which one to take.填both不行吗?
Tom had to buy __these CDs because he did not kno w which one to take.
填both不行吗?

Tom had to buy __these CDs because he did not kno w which one to take.填both不行吗?
填 all (所有的)

这个题目是要填空吗?

是不是填all?