下列词语中加点的字，每对读音都不相同的一组是（）

A．揣度/置之度外　称职/称兄道弟　模仿/装模作样

B．扛旗/力能扛鼎　行当/行云流水　绰约/绰绰有余

C．殉职/徇私枉法　弹劾/言简意赅　疏浚/日月如梭

D．晦暗/诲人不倦　揣摩/惴惴不安　格律/恪守不渝

—Why do you collect so many old bikes?

—I'Il have them       _ and give away to the children who don't have bikes.

A．used up

B．given up

C．fixed up

D．set up