单项选择题

兰科(Orchidaceae)植物花因子房呈180°扭转,使唇瓣位于上方。( )

A.正确
B.错误
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单项选择题
It was not until she had finished all her work().

A.did she return
B.that she returned
C.when she returned
D.that did she return

单项选择题
_____将各种不同的管理风格分为三类:传统的管理风格、过渡的管理风格、科学的管理风格。
A.莉莲.吉尔布雷思
B.玛丽.福莱特
C.亨利.明茨伯格
D.哈罗德.孔茨
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