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I couldn't have got to the meeting on time --- _______ an earlier train .


  1. A.
    if I had not caught
  2. B.
    unless I had caught
  3. C.
    if I did not catch
  4. D.
    unless I caught
B
if…not和unless有时可以互相替换,但也有不能互相替换的时候。unless用于这样的句子,即"如果A不受阻于B,A将发生",例如:He will accept the job if the salary is not too low / unless the salary is too low . (如果薪水不太低,他就会接受这一工作/除非薪水太低,否则他会接受这一项工作的。)但是unless不能用于"由于未发生B而发生A"的句子里,如:I will be quite glad if she does not come this evening (她今天晚上要是不来,我才高兴呢。)又如:I will be surprised if he does not win the game next week . (如果他赢不了下星期那场比赛,我倒会感到惊奇的。)在以上的两个句子中不能使用unless,但是unless常用来引导一个谈及过去的事后的想法,unless从句跟着主句,通常用破折号而不是逗号将它与主句分开。本题的句意是:我不可能准时到会了-除非我当时赶上更早一列火车。这个句子的实际是说:我没有准时到会。我只有赶上更早的一趟火车,才能准时到会。如果用if … not代替上面句中的unless,那么这个句子就变成:I couldn't have got to the meeting on time if I hadn't caught an earlier train . (要不是我赶上了更早的一班火车,我就不可能准时到会。)这句话表达的意思与上句完全相反:我确实准时到会了,因为我赶上了更早的一趟火车。
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【小题1】
A.proper B.usual C.same D.right
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A.childhood B.the armyC.his thirtiesD.college
【小题3】
A.considered B.met C.supposed D.expected
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