单项选择题
China is one 0f the ______ countries．
A．develop
B．developed
C．developing
D．development
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单项选择题
It is necessary for technicians ______ one or two foreign languages．
A．master
B．to master
C．mastering
D．mastered
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单项选择题
Having saved ______ money, Mary was able to buy her elder sister a watch.
A. few
B. a few
C. little
D. a little
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