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We can learn about ____(use) the telephone , ____(ask) and ___ (answer) questions.怎么填,为什么?

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We can learn about ____(use) the telephone , ____(ask) and ___ (answer) questions.怎么填,为什么?
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答案和解析
We can learn about using (use) the telephone , asking _(ask) and answering(answer) questions.
第一空因为有介词about,所以填using,之后为了并列,故都填ing形式
有不会的可以再问我