Since China started 5G commercialization (商用) in June 2019, many Chinese companies ________ to provi...
2022-06-05 15:34:21 202次 2020年江苏省南京市玄武区九年级下学期学情调研英语试卷 单选题 反馈错误 加入收藏 正确率 : 100%
题目内容：
Since China started 5G commercialization (商用) in June 2019, many Chinese companies ________ to provide 5G services.
A.started B.were starting C.start D.have started
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