Although he had to spend lots of money for going to the ball, he accepted the invitation.____,

the ball was important to him. [ ]

A. After all

B. In all

C. First of all

D. Above all

齿轮泵在运行一段时间后，泵体的磨损一般发生在（）部位。

A.吸油腔

B.压油腔

C.齿轮

D.传动轴