He comes from USA 为什么这里USA没有用冠词啊!

He comes from USA 为什么这里USA没有用冠词啊! Jim comes from USA.( )- He comes from the USA.He is a doctor. David comes from the USA. Jack comes from the USA.He 1 in Los Angeles He comes from the USA.对画线部分提问 -------- paul comes from usa改为否定句 The girl___big eyes comes from the USA jim comes from USA 改同义句 Does Jack come from the USA? No,he comes from E_____. Jack comes from the USA.He 1 in Los Angeles.He likes 2 to di 英语阅读题jim comes from the USa .He is now living in China. He g