Do you think most students prefer tests          have easy questions?[ ]

A. who            

B. where

C. that             

D. it

钢丝绳本身钢丝间的摩擦也会造成磨损，若钢丝绳润滑状况良好，绳芯浸满油，可显著提高钢丝绳的使用寿命。