This book is the perfect______to the seven continents.
A. produce
B. production
C. reduce
D. introduction
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I always dreamed of becoming the _____of an orchestra.
A. production
B. conduct
C. conductor
D. semiconductor
withdraw 的意思是?
A. 撤回
B. 后悔
C. 删除
D. 绘画
downstairs 的反义词是?
A. indoors
B. outdoor
C. upstairs
D. outdoors
请补充下列单词。documen__ry adj.文件的;文档的
A. to
B. te
C. ta
D. tae