I couldn't have got to the meeting on time - an earlier train . A. if I had not caught B. unless I had caught C. if I did not catch D. unless I caught 答案是B项.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.第7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. 【查看更多】

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

A. if I had not caught B. unless I had caught C. if I did not catch D. unless I caught

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

A. if I had not caught B. unless I had caught C. if I did not catch D. unless I caught

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I couldn’t have got to the meeting on time____________ an earlier train.

A. if I had not caught B. unless I had caught

C. if I did not catch D. unless I caught

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

A.
if I had not caught
B.
unless I had caught
C.
if I did not catch
D.
unless I caught

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

[　　]

A．

if I had not caught

B．

unless I had caught

C．

if I did not catch

D．

unless I caugh

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