帮我看一下这个英语句子

帮我看一下这个英语句子
Fog and haze is an serious problem needed to solve.我想知道那个needed用的对不对
或者Fog and haze is an serious problem which need to solve呢?to用不用加?
英语人气:811 ℃时间:2019-10-11 21:48:42
优质解答
Fog and haze is an serious problem needing to be solved.
Fog and haze is an serious problem which/that needed to be solved.
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