Question

4.         ，we'd brought a road map without which we would have lost our way.

   A. Generally   B. Luckily

   C. Usually   D. Obviously

Answer 1

4. B从句中所使用的动词时态来看，这里显然谈及的是过去的某一次经历，所以选择B项luckily,表达"幸运的是"。generally意为"一般而言",usually意为"通常地"，obviously意为"很显然"，皆不符合题意。