If powerful mesures ______, thisre would hve been bdly polluted.ren’t tkenB.hveIf powerful mesures ______, thisre would hve been bdly polluted.ren’t tken B.hven’t been tken C.weren’t tken D.hdn’t been tken

A.aren’t taken B.haven’t been taken C.weren’t taken D.hadn’t been taken

时间:2023-01-12 09:13:12

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