单选题 When we have difficulty ______ obtaining desired objects or reaching desired goals we experience negative emotions such as grief and anger.
A. at B. in C. on D. with

【正确答案】 B

【答案解析】[解析] 词语搭配题。have difficulty (in) doing sth.为固定搭配，意为“做某事有困难”。其中in可以省略。