题目

有八种物质：①甲烷，②苯，③聚乙烯，④聚异戊二烯，⑤2丁炔，⑥环己烷，⑦邻二甲苯，⑧环己烯，既能使高锰酸钾酸性溶液褪色又能与溴水反应使之褪色的是(    ) A.③④⑤⑧                                   B.④⑤⑦⑧ C.④⑤⑧                                     D.③④⑤⑦⑧Whatever you do, you need to try your best ____ you can succeed.A. so thatB. in orderC. not untilD. only if