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Thefirsttextbooks______forteachingEnglishasaforeignlanguagecameoutinth16thcentury为什么不用TOBEWRITTEN而用W
题目内容：
The first textbooks______for teaching English as a foreign language came out in th 16th century
为什么不用TO BE WRITTEN 而用WRITTEN优质解答
这不是显然的嘛,“in th 16th century”在过去啊,“TO BE WRITTEN”表将来啊
为什么不用TO BE WRITTEN 而用WRITTEN
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