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Until then, Siemens 10000 thyristor valves. [ ] A．producedB．has been producing C

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Until then, Siemens 10000 thyristor valves. [ ] A．producedB．has been producing C

Until then, Siemens ________ 10000 thyristor valves.

[]

A．producedB．has been producingC．has producedD．had produced

试题答案

答案：C

解析：

Until then后用现在完成时，所以选C。

标签：thyristorvalvesuntilthensiemens

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