I coutdn't 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

B


解析:

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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