单项选择题

A．taken
B．derived
C．got
D．attained
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单项选择题
A．learnedB．studiedC．wantedD．found
A．learned
B．studied
C．wanted
D．found
单项选择题
A．occurB．occursC．occurringD．occurred
A．occur
B．occurs
C．occurring
D．occurred
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