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

if．．．not和unless有時(shí)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，unless常用來(lái)引導(dǎo)一個(gè)談及過(guò)去的事后的想法，unless從句跟著主句，通常用破折號(hào)而不是逗號(hào)將它與主句分開(kāi)。

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