第21题: [单项选择]I wish I ______ able to help you. But the problem is that I am too busy to spare even one minute. A. am B. will be C. were D. shall be 参考答案:C 答案解析:[解析] 此句为由wish引导的非真实条件句。由wish引导的虚拟语气的具体用法:主语+wish+(that)+从句主语+were/would+动词/could+动词/did/had+过去分词。此句为