Gold in California in the nineteenth century. [ ] A．was discoveredB．has been discovered C．was discoveringD．was to be discovered 题目和参考答案——青夏教育精英家教网—

题目内容

Gold ________ in California in the nineteenth century.

[　　]

A．was discovered

B．has been discovered

C．was discovering

D．was to be discovered

答案：A

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