— 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：初中英語 來源：河北省期末題 題型：單選題

— 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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