问题补充:
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
答案:
A. having written
B. to be written
C. being written
(答案→)D. written
解析:单个过去分词作定语置于被修饰的名词前,过去分词短语作定语置于被修饰的名词后。过去分词作定语表示被动、完成的动作,而且被修饰的名词是过去分词动作的承受者。