以下选项中循环结构合法的是( )。

A．while (int i＜7)
(i++;
system.out.println("i is "+i);

B．int j=3;
while(j)
system.out.println("j is "+j);
C．int j=0;
for(int k=0;j+k!=10;j++,k++)
system.out.println("j is "+j+"k is "+k);
D．int j=0;
do
system.out.println("j is "+j++);
if(j==3) continue loop;
while(j<10);