Question

一道高考英语题（谢谢详解）

i didn't manage to do it ( ) you had explained how.
A.until B.unless C.when D.before
为什么不选B,C,D呀?我觉得也行呢!

Answer 1

not...until固定句型，直到...才...。直到你解释了怎么做我才会做。

Answer 2

a

楼上错了，这句的意思是，直到在你解释怎么做之前我都不会做

Answer 3

A,
i do manage to do it not until you had explained how.
do 是强调，可以不用，意思是：在你没解释怎么做之前，我就会做了。

Answer 4

not...until 直到...才 等于unless