问题补充:
I coutdn have got to the meeting on time an earlier train.
A. if I had not caught
B. unless I had caugh
C. if ! did not catch
D. unless I caugh
答案:
A. if I had not caught
(答案→)B. unless I had caugh
C. if ! did not catch
D. unless I caugh
解析:if...not和unless有时也不能互相替换。unless不能用于“由于未发生B而发生A”的句子里,如:1 will be quite斟ad if she does not come this evening。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。
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