在Java中，下列循环结构合法的是（)。

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;do{System.out.println("j is "+j++);if (j = = 3) {continue loop;}}while (j＜10);

D.int j=9;do{System.out.println("j is "+j++);if (j = = 3) {continue loop;}}while (j＜10);