You had better book rooms at the hotel in advance you should find no room on your arrival.
A. so that
B. even if
C. in case
D. now that
网友回答
A. so that
B. even if
(答案→)C. in case
D. now that
解析：A以至于；B即使，尽管；C以防；D既然；句义：你最好提前在宾馆里预定房间，以防在你到的时候没有房间了。根据句义说明C正确。