摘要： 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
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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
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