safe.
首先 keep+adj,其次,根據題意 只有 keep people safe 更符合題意
they also help to keep people (safe.)為什么不safely,healthy,careful?
they also help to keep people (safe.)為什么不safely,healthy,careful?
英語人氣：325 ℃時間：2019-12-18 01:18:05
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