Though _____ in the accident, the bus driver did all he could to help the passengers to safety.

A．injuring

B．injured

C．to injure

D．having injured

按《商用汽车发动机大修竣工出厂技术条件》（GB/T3799.1～.2—2005）的规定，《发动机大修过程检验单》中对主要零部件检验内容包括：（）。

A．活塞连杆组

B．汽缸直径

C．汽缸盖

D．曲轴、凸轮轴与轴承