:======>>一道SAT语法,24H认准:======>>标志,天天有题,收到答案起24小时内必定给分,难题分值会相应提高.ittooktheMuseumofModernArtinNewYorkhalfacenturyofcreativeandpersistenteffort(anditacquiredtheouts

Question

:======>>一道SAT语法,24H
认准:======>>标志,天天有题,收到答案起24小时内必定给分,难题分值会相应提高
.it took the Museum of Modern Art in New York half a century of creative and persistent effort (and it acquired the outstanding Picasso collection)
before their outstanding Picasso collection being acquired
答案有being 不是有being都错么?我选A ,（就是原文）那里有问题?

Answer 1

谁告诉你一定有being 就会错?
before their outstanding Picasso collection being acquired
这句话中 before 是介词啊,
你肯定知道,表被动必须要 用 been done 的结构,但是 before 是介词,后面的动词一律要加+ing