单项选择题

A．longest defended border
B．longest undefended border
C．longest undefined border
D．longest coastal border
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填空题
film→filming
单项选择题
A．taking further photosB．taking soil samplesC．planting vegetation in the soilD．taking samples of vegetation
A．taking further photos
B．taking soil samples
C．planting vegetation in the soil
D．taking samples of vegetation
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