单项选择题

A．She will help him.
B．She finished hers two days ago.
C．She completed her work very quickly.
D．She is still doing the project.
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develop→be developed
单项选择题
A．By using satellite images, maps, etc.B．By studying specific farming methods.C．By studying the variation of human population.D．By analyzing the quality of crops.
A．By using satellite images, maps, etc.
B．By studying specific farming methods.
C．By studying the variation of human population.
D．By analyzing the quality of crops.
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