Since China carried out the one-child policy,the population inscrease rate had dropped,but （接下）（接上）much still needs doing.是什么意思啊?

China has already carried Since China carried out the one-child policy,the population inscrease rate had dropped,but （接下）（接上）much still needs doing.是什么意思啊? 现在完成试的被动语态Since the policy of reform and opening up was carried out in China ,great social progress hasbeen made the ship carried the national f___of China carried 现在完成试的被动语态变被动Since the policy of reform and opening up was carried out in China ,great social progress hasbeen made噢噢 错了 是变主动 they_____(live)in china since they___(move)to china china has carried out some new agricultural polices ,_aimed__at improving ... 为什么要填aimed呢 谢 ever since可以直接等于since吗We have lived in Shanghai ever since we came to China .（可以把every since换成since吗） Jim has made many friends since he ___to china. Mrs.Brown ___(teach) English in China since last year. Mary ____ ____in China since three years ago .填什么 nancy has been in china since last year错在哪儿 The Whites______many piaces of interest since they came yo China What have you done since you returned to China? Tom has been at this school since he come to China.对since he come to China提问. Mr Green left China last week.Mr Green ____ ___ ___ ___ China since last week. Paul left China three days ago,(改为同义句Paul ( ) (　　) ( ) ( )China since three days ago.