It has been three hours since he left his office.把has been 换成is也可以吗

It has been three hours since he left his office.把has been 换成is也可以吗 英语 完成时It has been raining for three hours.为什么要加been?加been不是表被动么? It＿for three hours.When will it stop?A.has rained B.has been raining C.is raining It __is_________(be) three years since Lily joined the Green.为什么不是 has been he has been a soldier for three years.改为同义句：It is three years --------- ---------- ---------the army. lucy has been away from hei home for three years等于 it's three years ______lucy ___ __________ Tom has been in China for three years.(改为同义句)1.Tom has been in China ( ) three years( ).2.Three year ( ) ( ) ( ) Tom cane to China.3.Tom ( ) ( ) China three years ( ).4.It is ( ) ( ) ( ) Tom came to China. Tom has been in China for three years.(改为同义句)1.Tom has been in China ( ) three years( ).2.Three year ( ) ( ) ( ) Tom cane to China.3.Tom ( ) ( ) China three years ( ).4.It is ( ) ( ) ( ) Tom came to China. my watch has been going for three days and it has got run down yet怎么翻译? He has been to shanghai three times.根据 three 提问 他来了三天了 it is three days since he came it has been three days since he came 这两个有什么区别都正确吗 It has three a's in it. It has rained for three days 这个用法对吗?rain是动态动词,可以用于带‘for’的现在完成时吗?还是应该是 It rained for three daysIt has been raining for three days it has been since.用法 It has been in my it is/has been= It's has been accepted it has long been assumed