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Pollution is one of the most serious chanllenge we face.

发布于 2021-02-18 21:51:55

【单选题】
A 我们面临的最严重的挑战之一是污染问题。
B 污染是我们面临的最严重的挑战之一。
C 污染是我们面临的一个最严重的挑战。

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李佳航 2023-02-18

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步云☁️

这家伙很懒，什么也没写！

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