Beavers Ause small logs, sticks, and mud for Bbuild dams that can Clast for many Dyears.

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问题 Beavers Ause small logs, sticks, and mud for Bbuild dams that can Clast for many Dyears.

选项 A、 
B、 
C、 
D、 

答案B

解析 Build is an incorrect form where a gerund is needed after the preposition for. Correction: building.
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