They decided not to climb the mountain because it was raining .AbadB. hardCstrongly

问题补充：

They decided not to climb the mountain because it was raining .

Abad

B. hard

Cstrongly

Dhardly

答案：

A. bad

(答案→)B. hard

C. strongly

D. hardly

解析：句意：他们决定不去爬山是因为雨下得很大。bad坏的； hard adj.困难的; 硬的; 有力的; 努力的; adv.努力地; 猛力地; 严重地; 沉重地; strongly 强烈地；hardly几乎不。说雨下得大习惯用副词hard，所以选B。