1.TherehavebeengreatchangesinShanghai____youwentabroad.A.whereB.untilC.sinceD.fo

1. There have been great changes in Shanghai ____ you went abroad.
A.where B.until C.since D.for
2. In fact ____ is really a hard job for the police to keep order in an important football match.
A.this B.that C.there D.it
3. The workers went ____ for two months to protest against their rights.
A.in stick B.on stick C.in strike D.on strike

1.C since引导的状语从句的谓语动词是终止性的过去时，则从句表示的时间是“从动作开始的那一时刻起”，从你去国外到现在的这段时间里，上海发生了很大的变化

2.D 这里it是同位语，指代的是to keep order in an important football math 就是说句子其实可以替换成:(To keep order in an important football math) is really a hard job for the police.

3.D on其实是和went搭配的，went on doing sth 或者 went on sth 继续做某事。went on strike 继续罢工

我选C\D\D

我的选择：C D D

你好！ since，it, on strike. 仅代表个人观点，不喜勿喷，谢谢。

如以上回答内容为低俗、色情、不良、暴力、侵权、涉及违法等信息，可以点下面链接进行举报！

点此我要举报以上问答信息！