Thebiggestchallengew的精选

问题详情：Thebiggestchallengeweallfaceistopreventfurtherenvironmentaldisasters.We________takeactionbeforeitistoolate.A．canB．mustC．mayD．might【回答】B【详解】句意：我们面临的最大挑战是防止进一步的环境灾难。我...