摘要： Bob would have helped us yesterday, but he- A. was busy B. is busy C. had been busy. D. will be busy 答案:A. 考点:本题考查虚拟语气与时态. 解析:前句表示对过去的虚拟.而but之后表示过去的客观事实.故用一般过去时态.17. If he my advice, he wouldn't have lost his job. A. followed B. should follow C. had followed D. would follow 答案:C 考点:考查虚拟语气. 解析:根据“wouldn’t have lost 可判断if引导的状语从句表示与过去事实相反的虚拟. 故选C项.

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