第20题: [单项选择]The doctor insisted that he ______ seriously ill and that he ______ operated on immediately. A. be; should be B. was; be C. was; must be D. should be; should be 参考答案:B 答案解析:考查动词语气。insist后跟宾语从句时,如果跟的是客观事实,则遵循一般主从句的时态原则,如果后面跟的是一种观点,那么从句要用虚拟语气。本题前一个从句表示的是过去的事实,故用一般过去时态;后一个从句表