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
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单项选择题
Let's ______ this has never happened.
A．make believe
B．make to believe
C．to make believe
D．to make to believe
单项选择题
Within 2 years, the turnout of this mobile phone manufacturing company increased ______.
A．ten fold
B．ten-fold
C．ten-time
D．ten-folds
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