The first set oftextbooks for teaching English as a foreign language came out in
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The first set oftextbooks ________ for teaching English as a foreign language came out in the16th century.
A.written
B.had beenwritten
C.to bewritten
D.waswritten
试题答案
A
the first set oftext books……in the 16th century说明书的写作是过去且为被动用过去分词。