many young people spend much of their spare time _online.A.getB.to get C.getting 选择?为何?

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many young people spend much of their spare time _online.A.getB.to get C.getting 选择?为何?

C,spend in doing sth 固定词语,花费.做某事(其中in可以省略).

选C 因为 spend some time (on)doing sth。

C spend sometime doing something 意为花费时间做某事,是固定搭配,故答案为C选项。