问题补充:
The first textbook 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:主要测试非谓语动词。过去分词作定语表被动、完成;而现在分词的被动式作定语,则表进行、被动。由句子可知此处textbook和write之间为被动关系。
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