单选题 If there were no hungry problem, the people of the world ______ a much happier time in their daily life.
A. should have B. will have
C. must have D. have

【正确答案】 A
【答案解析】[解析] 由从句可知这句话是虚拟语气，表示对现在情况的虚拟，动词形式为：从句：动词的过去式(be的过去式一般用were)，主句：would/should/could/might+动词原形。