The first textbooks ____ for teaching English as a foreign language came out in the 16th century.(NMET94 34)

The first textbooks ____ for teaching English as a foreign language came out in the 16th century.(NMET94 34)
A.having written B.to be written C.being written D.written
为什么选D?
英语人气:658 ℃时间:2020-01-29 05:36:37
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D.=the first textbooks (which are)written for...
省略了从句的主谓
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