The environment will be further polluted unless some measures .
A. are taken
B. will be taken
C. are being taken
D. should be taken
网友回答
(答案→)A. are taken
B. will be taken
C. are being taken
D. should be taken
解析：考查时态：句意：环境将被进一步污染，除非一些措施被采取。主句是一般将来时，Unless引导的是条件状语从句，用一般现在时代替将来时。选A。