问题
选择题
— 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
答案
答案：D
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— 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
答案：D