Until then, Siemens ________ 10000 thyristor valves.
A.producedB.has been producingC.has producedD.had produced在线课程C
Until then后用现在完成时，所以选C。
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Until then, Siemens 10000 thyristor valves.A.producedB.has been producingC.has producedD.had produce
编辑：chaxungu时间：2026-04-24 12:55:18分类：高中英语题库
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