A. does B. has done C. will do D. would do (1998.6)
       
        Explanation and Expansion
        A. 参考答案： 1）C 2） D 3） B 4） A
        B. 评析
        从以上各题可以看到，在解时态考题时应注意一下几点：
        ① 结合形容词选择时态，如2）。从unlikely一词可以看出从句表示的是将来不大可能发生的事情，自然用一般将来时。类似的形容词还有possible, probable, impossible等。
       
        ② 根据时态判断时间状语。如3）。谓语动词为将来时态，说明时间应该是in a moment，表示我一会就去见你。for a moment同样可以与将来时态连用，但表示的是"与某人一块待一小会"，这样就与上文的I can't see you immediately意思上冲突。
       
        ③ 注意句型对时态的要求，如1）。该句型中祈使句表示一种条件，第二个分句中一般要用will表示在这种条件下可能发生的事情。但是，本题中often的使用可能会造成一定的迷惑。这就要求考生对各种时态的表达方式，以及其作用了解清楚。Will可以表示习惯。
       
        ④ 注意时间、条件和让步状语从句中时态的运用。
       
        一般在时间、条件和让步状语从句中用一般现在时表示一般将来，用一般过去时表示过去将来，用现在完成时表示将来完成，用过去完成时表示过去将来完成。如4）。在如：
        He promised to send me an email as soon as he got there.
        No one is to leave the room until he has done the task.
        但注意特殊句型中的时态，如：
        hardly/scarcely …when…
        no sooner… than…
        Hardly had I put down the receiver when the telephone rang again.
        No sooner had they got to know the news than they went to the bar to enjoy a drink.
       
        Self-practice
        请同学们做《语法分册》第五章 第六节进行自我训练。
       
        Test Yourself
        刚才我们一起分析了时态的考查特点和答题时应该注意的事项，现在我们一起来看一下语态的考查。语态的考查一般都与时态的考查相结合。在解语态题的同时必须考虑时态的因素。请同学们先做以下下列各题：
        1) The last half of the nineteenth century ____ the steady improvement in the means of travel.(1998.6)
        A. has witnessed B. was witnessed C. witnessed D. is witnessed
       
        2) The grey building is where the workers live, and the white one is where the spare parts ____.(19995.1)
        A. are producing B. are produced C. produced D. being produced
        3) This kind of glasses manufactured by experienced craftsmen ____ comfortably.
        A. is worn B. wears C. wearing D. are worn (2000.1)
       
        4) The fifth generation computers, with artificial intelligence, ____ and perfected now.(1996.1)
        A. developed B. have developed C. are being developed D. will have been developed
       
        5) Sir Denis, who is 78, has made it that much of his collection ____ to the nation.(1996.6)