Here are some tips to help you stay safe when (use) ______ride-hailing apps.

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问题 Here are some tips to help you stay safe when (use) ______ride-hailing apps.

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答案using

解析 when引导时间状语,但没有主语,故用非谓语动词,考虑用分词作时间状语,再判断use前的逻辑主语为you,与use的关系为主动,故用现在分词using。
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