?前不久

... shortly afterwards不久以后;没过多久 shortly before前不久 appear shortly即将出版 ...

?在

... shortly after 在...之后不久 shortly before 在...之前不久 shot n. 炮弹,射击,射手; v. 射击,发出,发芽; vbl. 射击,发出,发芽 ...

?以前不久

... how long多久；多长 shortly before…以前不久 how soon过多久 ...