驾驶机动车在拥堵的路口遇到这种情况怎样处置？

A、逼其回原车道
B、紧跟前车不让行
C、礼让通行
D、鸣喇叭开前照灯

He was so tired that he fell asleep ___he went to bed.

A．as if

B．even though

C．ever since

D．as soon as