To live a happy life,we must take some measures to prevent pollution ___it is too late
A、since B、when C、once D、 before
人气：203 ℃ 时间：2019-11-15 01:59:52
解答
To live a happy life,we must take some measures to prevent pollution before it is too late
要过上幸福的生活,我们必须采取措施,防止污染,要不就太迟了
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