until 前面不能用逗号, unless 前面可以用或者不用逗号。所以,这道题的答不能选择A. until。
until 可以作连词或者介词, unless 只能作连词。
I won't come into the room until you call me. I won't come into the room unless you call me .意思上有区别,但是语法上是都可以。
-Mom, can I go out to play for a while?
-No, you can't, ________ you finish your homework.
A. until B. if C. unless D. because
标答:C
想问下A可以吗?想问一下按照中文翻译 until 和unless都可以的情况下怎么区分?e.g. I won't come into the room until you call me. I won't come into the room unless you call me .意思上有区别,但是语法上是都可以吗?