请问下列这三题 因为实在不懂为什麽是这答案 所以请懂的人为我解说一下 1. The job of an arbitrator is ____ disputes between two or more parties. A. settled B. to settle C. being settle D.settler (Ans. B) 2. The plan to advertise on national television had to be dropped due ___costs. A. to increase B. to increased C. increasing D. being increased (Ans.B) 3. Pooling resources is one way for small companies ____ a presence in the research and development field. A. to maintain B. maintaining C. maintained D. maintain (Ans.A) 谢谢^^ --

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