You have no idea how she finished the relay race ____ her foot       so much.

A．for; wound

B．when; wounded

C．with; wounded

D．while; wound

用千斤顶支承工作时，三个支承点所组成的三角形应该（）．

A、尽量大      

B、尽量小    

C、最大    

D、不大