We all know _____ pollution is _____ big problem. A. the, / B. a, / C. /, a D. /, the
2022-10-07 23:06:59 44次 人教英语九年级Unit 13 We’re trying to save the earth单元分段练习 单选题 反馈错误 加入收藏 正确率 : 100%
题目内容：
We all know _____ pollution is _____ big problem.
A. the, / B. a, / C. /, a D. /, the
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