People who have studied ancient instruments are hoping to learn more about the culture that this ancient flute.
A. produce
B. produced
C. is producing
D. was produced
网友回答
A. produce
(答案→)B. produced
C. is producing
D. was produced
解析：考查定语从句。that引导以the culture为先行词的定语从句，that在从句中做主语，动作发生在过去所以用一般过去式。句意是研究古乐器的人希望了解更多的有关生产这种古长笛的文化。故选B。