—Where's the report?      

—I brought it to you ____you were in Mr. Black's office yesterday.    [ ]

A. if                        

B. when    

C. because                  

D. before

方向柱轴承调整螺母过紧将引起（）都。

A.转向不灵

B.行驶阻力大

C.方向发抖柱轴承损坏

D.行驶跑偏