问题补充：
The factory is said with modern instruments from America.
A. to have equipped, to have introduced
B. to be equipped , introcuced
C. to have been equipped, having been introduced
D. having been equipped, having been introduced
答案：
A. to have equipped, to have introduced
(答案→)B. to be equipped , introcuced
C. to have been equipped, having been introduced
D. having been equipped, having been introduced
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