题目内容
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
试题答案
21、A
解析：the first set of text books……in the 16th century说明。书的写作是过去且为被动用过去分词。
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