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
The most successful way to solve the language problem while a foreign play is being performed is translation.
A．instantaneous
B．spontaneous
C．simultaneous
D．homogeneous
单项选择题
The explosion in the mine was by a careless miner who lit a match.
A．triggered
B．claimed
C．hampered
D．protested
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