I coutdn't have got to the meeting on time____________ an earlier train.
A．if I had not caughtB．unless I had caugh
C．if ! did not catchD．unless I caugh
B
if．．．not和unless有時也不能互相替換。unless不能用于“由于未發(fā)生B而發(fā)生A”的句子里，如：1 will be quite斟ad if she does not come this evening。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。
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