As we know, it will still be some years before all the metro lines in Suzhou _____ into operation. A...
2022-08-14 07:17:12 213次 江苏省常熟市2019-2020学年高三上学期期中英语试卷 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
As we know, it will still be some years before all the metro lines in Suzhou _____ into operation.
A.will be put B.are put C.will have been put D.are being put
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