The factory is polluting air. It must ________． A. close down B. be closed down C. pull down D. be p...
2022-10-07 18:01:59 183次 人教新目标版英语九年级全册 Unit 13 We 单选题 反馈错误 加入收藏 正确率 : 100%
题目内容：
The factory is polluting air. It must ________．
A. close down B. be closed down C. pull down D. be pulled down
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