I coutdn't have got to the meeting on time____________ an earlier train.
A.if I had not caughtB.unless I had caught
C.if ! did not catchD.unless I caught
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,如:1 will be quite斟ad if she does not come this evening。unless常用來引導(dǎo)一個(gè)談及過去的事后的想法,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。
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