Now many young people spend several hours a day (talk) ________on a mobile phone

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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 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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