单项选择题


A．children's
B．boy's
C．girl's
D．child's
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单项选择题
The professor ______ his habit of getting up early in the morning to do writing all his life.
A．projection
B．retained
C．retailed
D．revitalized
单项选择题
A．questionB．problem'sC．problemsD．problem
A．question
B．problem's
C．problems
D．problem
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