21、The first set of textbooks________ for teaching English as a foreign language came out in the 16th century.
A.
written B. had been
written
C. to be written D. was written
科目：高中英语 来源： 题型：
The first set of textbooks________ for teaching English as a foreign language came out in the 16th century.
A. written B. had been written C. to be written D. was written
科目：高中英语 来源： 题型：
The first set of textbooks_____ for teaching English as a foreign language came out in the l6th century.
A. written B. had been written C. to be written D. was written
科目：高中英语 来源： 题型：014
The first set of textbooks ________ for teaching English as a foreign language came out in the 16th century.
A．written
B．had been written
C．to be written
D．was written
科目：高中英语 来源：英语教研室 题型：014
A．written
B．had been written
C．to be written
D．was written
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