阅读下面程序:
public class ThreadTest
public static void main(String args[]) throws Exception
int i=0;
Hello t=new Hello();
______;
While(true)
System.out.println("Good Morning"+i++);
if(i==2&&t.isAlive())
System.out.println("Main waiting for Hello!");
t.join(); //等待t运行结束
If(i==5)break:
class Hello extends Thread
int i;
public void run()
while(true)
System.out.println("Hello"+i++):
If(i==5)break;
为使该程序正确执行,下画线处的语句应是
A.sleep()
B.yield()
C.interrupt()
D.start()