Now many young people spend several hours a day(talk)______on a mobile phone。(in

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问题 Now many young people spend several hours a day(talk)______on a mobile phone。

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答案 (in)talking

解析句子的谓语动词是spend，其用法为sb．spend some time(in) doing sth.，其中介词in可以省略。由此可以确定，空格处需要使用talk对应的动名词形式(in)talking。

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