判断颅脑损伤患者有无颅底骨折，最有价值的临床表现是（）

A.眼睑淤血

B.球结膜下出血

C.呕吐

D.脑脊液漏

E.严重头痛

The reason ________ he was late for the meeting was _______ his car had broken down on the road.

A．why; because

B．why; that

C．that; that

D．for which; because