我国最长的湖底隧道--独墅湖隧道全长3460米，一辆汽车从隧道通过，这辆汽车从开始进入隧道到完全驶出隧道共用了200.5秒，而整辆汽车在隧道内的时间为199.5秒．问：这辆汽车全长几米？汽车的速度是多少？

Tough __________ the task was, we _______ finish it ahead of time and therefore we were highly praised for it.

A．though; would

B．although; had to

C．as; were able to

D．though; must