单项选择题

A．learned
B．studied
C．wanted
D．found
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单项选择题
A．occurB．occursC．occurringD．occurred
A．occur
B．occurs
C．occurring
D．occurred
单项选择题
A．ecologistB．biologistC．geologistD．anthropologist
A．ecologist
B．biologist
C．geologist
D．anthropologist
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