单选(means)

来源：学生作业帮编辑：神马作文网作业帮分类：英语作业时间：2024/11/18 00:51:44

Every possible means to prevent the air pollution,but the sky is still not clear.
A is used B are used C has been used D had been used
这几个选项用法有什么区别？

解题思路： means 作主语谓语动词应用单数,排除B.再由后句but the sky is still not clear中is still
解题过程：
可知用现在完成时,选C
最终答案：略

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