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    精英家教网 > 初中英语 > 题目详情
    — Do you know when the technology for hybrid rice            to the United States?
    — Yes. In 1980.

    A. introduced
    B. introduces
    C. is introducing
    D. was introduced
    D
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    科目：初中英语 来源：河北省期末题 题型：单选题

    — Do you know when the technology for hybrid rice            to the United States?
    — Yes. In 1980.
    [     ]
    A. introduced
    B. introduces
    C. is introducing
    D. was introduced

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