it was not until the thirteenth stroke___the bell stopped.1 befor_英语解答

it was not until the thirteenth stroke___the bell stopped.1 before 2 when 3 so that 4 that
选择哪一个,及分别说出每个为什么对与错

人气：422 ℃　时间：2019-11-23 03:55:41

解答

选4
这是一个固定句式,是强调句型的一种特殊情况,it is/was not until...that...直到……才