单选题 If the United States had not entered the Second World War, probably the unemployment rate ______ still further.
A. would rise B. should rise
C. would have risen D. had risen

【正确答案】 C

【答案解析】[解析] 根据句子结构，我们可以看出该句使用了虚拟语气。因为在条件从句中谓语动词用的是过去完成时，所以主句就相应采用would have done sth. 结构，例如：If you had come here yesterday, you would have met Professor Chomsky. 你昨天来这里的话，就会见到乔姆斯基教授了。因此只有C项是正确答案。