有一个dowbload(url)函数下载url图像:import threadingdef download(url): pass用多线程调用它，方法是：

A、T=threading.Thread(target=download,args=[url])T.start();

B、T=threading.Thread(target=download,args=url)T.start();

C、T=threading.Thread(target=download,args=(url))T.start();

D、都不对