Recent years have witnessed a worsening trend in road safety.这个句子对吗?我怎么觉得没有主语,但是这是一个范文

·In recent years there have been many changes,可否写成In recent years there were many changes, what ___to longyan in recent years a.have hawhat ___to longyan in recent years a.have happend b.has happend c.happend in the recent decades 还是in recent decades?in the recent years还是in recent years? But great changes have taken place in China in recent years They have learned about ______ in recent years.选项:a、several hundreds English words b、hundreds 是during the recent year还是during the recent years it is reported that in recent years severals new holiadays have been developed这句如何分析it is reported that in recent years severals new holiadays have been developed这句如何分析句子结构 Text messages have exploded in popularity in recent years.in popularity 是什么语 是状语还是宾语Text messages have exploded in popularity in recent years，particulary among young people.逗号后是副词引导的状语吗？ In recent years many football clubs （have been run）as business to make a profit.,为什么用这个时态? China has changed greatly in recent years.(改为同义句） Great changes have __ __ in China __. In recent years,great efforts have been made to increase the numbers of andkinds of people that pursue higher education. The recent five years have seen many great changes taking place in my hometown.为何不用taken place it is reported that in recent years severals new holiadays have been develop如何分析句子结构 it is reported that in recent years severals new holiadays have been develop需要分析句子结构 The number of people who access to their own cars risen sharply in recent years.A.has; has B.has; have C.have; have D.have; has There __great changes in our hometown in recent years A have taken B have been 我把A项输错了，应该是have taken place 英语.Recent years have witnessed a growing social mobility.主语是years吗?感觉怪怪的.牛津词典翻译是“近年来人们见证着社会流动性的增长” in recent years 前面用什么时态