A-A+ There () more than 300 000 kinds of plants on the earth.A.isB.are existingC.existsD. 2020-09-28 00:34:35 学历考试 阅读 问题详情 There () more than 300,000 kinds of plants on the earth.A.isB.are existingC.existsD.exist 参考答案 查看解答