885-03-01 difference between "until" and "as long as"

rongrong518

the sale of government surplus machinery will begin as 9am and continue until the supply lasts.

e: will begin at 9 am and continue as long as the supply lasts.



the answer is e, but i can't understand why a is fault. can someone tell me how to use "until"?

thanks a lot!

rhod

until后面应该加上一点时间，而不是持续性的一段时间。

rongrong518

thanks a lot!