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.

选项

答案using

解析本题考查现在分词作状语。use的逻辑主语与句子的主语you一致，二者是主动的关系，故用现在分词using作状语。

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大学英语三级B级

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