1、不久以后
辨析：四个选项中，by and by =soon, before long（不久以后），正符合题意.其余三个是；one by one（一个接一个地），after a while（过了一会儿）和long before（很久以前），都不合题意.
2、不久
...ruin the friendship 毁了友谊before long 不久as well (as) 也 ...
3、很快
... before long不久以后;很快;不久;很久以后 Before Sunset日落之前;爱在日落余晖时;爱在日落巴黎时;日落以前 Before Sunrise日出之前;爱在黎明破晓时;爱在黎明破晓前;情留半天 ...
4、不久当前
... now and then 时而,偶尔 before long 不久当前 that is (to say) 就是讲,即 ...
That before too long在不久之前
And Before Too Long又过一会
Before very long很快
before-long是什么意思
Before too long别等了太久
before e long很快;不久;不久往后
Before the long wiring加长前接线
long before long long ago很久以前
The Road Before Very Long漫漫前路