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項.if-not和unless有時可以互相替換.但也有不能互相替換的時候.unless用于這樣的句子.即"如果A不受阻于B.A將發(fā)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.他就會接受這一工作/除非薪水太低.否則他會接受這一項工作的.)但是unless不能用于"由于未發(fā)生B而發(fā)生A"的句子里.如:I will be quite glad if she does not come this evening (她今天晚上要是不來.我才高興呢.)又如:I will be surprised if he does not win the game next week . (如果他贏不了下星期那場比賽.我倒會感到驚奇的.)在以上的兩個句子中不能使用unless.但是unless常用來引導一個談及過去的事后的想法.unless從句跟著主句.通常用破折號而不是逗號將它與主句分開.第7題的句意是:我不可能準時到會了-除非我當時趕上更早一列火車.這個句子的實際是說:我沒有準時到會.我只有趕上更早的一趟火車.才能準時到會.如果用if - not代替上面句中的unless.那么這個句子就變成:I couldn't have got to the meeting on time if I hadn't caught an earlier train . (要不是我趕上了更早的一班火車.我就不可能準時到會.)這句話表達的意思與上句完全相反:我確實準時到會了.因為我趕上了更早的一趟火車. 【查看更多】

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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 caught

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