The driver was at______loss when________word came that he was forbidden to drive for speeding. [ ]

A. a; the  

B. /; /

C. the; the  

D. a; /

石油沥青防腐可在（）进行露天作业。

A.雨天

B.下雪天

C.大风天

D.无雨、无雪、无大风天气