The first textbooks__ for teaching English as a foreign lang
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The first textbooks__ for teaching English as a foreign language came out in the 16th century.
A,having written B,to be written C.being written D.written
优质解答：
4个选项分别是现在完成时、将来时、正在进行时和过去时,从句末16th century来看应该用过去时,所以是D