问题补充：
When , the wholesale vegetable market will be the largest one in China.
A. completed
B. completing
C. to be completed
D. being completed
答案：
(答案→)A. completed
B. completing
C. to be completed
D. being completed
解析：考查非谓语动词。主句的主语the wholesale vegetable market与complete之间是被动关系，故排除B；连词when与不定式是不会一起使用的，故排除C；而D项表示正在被完成，故答案为A。等于When it is completed,….
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