I have saved a lot of money,___I can buy a new piano答案是with which ,为什么呢?这是一个定语从句吧!

i could have saved you a lot of trouble if you 用什么形式（write)to me I have saved a lot of money,___I can buy a new piano答案是with which ,为什么呢?这是一个定语从句吧! i have changed a lot I have changed a lot i have saved them还是i had saved them I have a lot of homework-----(do) I have a lot to learn I still have a lot to learn. I have a lot of toys 疑问句 I have a lot of housework________ i have caught a lot of_____this year I have a lot of (headache) I have a lot of both i have saved the summer中文翻译 i didn't know anything about the computer program,or a huge amount of time and energy ___________A would have been saved B had been saved C has been saved D will be saved I have a guilty ___ because I could have saved the drowing child.A.consciousness B.mind C.conscience I think i have learned a lot today是什么句式? They work very hard all the year round and have saved a lot money _ A for B in order that C soD in order to