A是主动的过去的非谓语,textbook是被写 所以用被动written
主动：过去 having done 现在 doing 将来 to do
被动：过去 done 现在 being done 将来 to be done
这里的过去现在将来是与谓语动词时态比较
英语语法The first textbooks__D___ for teaching English as a fore
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