HUNG'S CLOCK DIDN'T RING

9. Hung's clock didn't ring. He went to school late.

A. Hung wouldn't have gone to school late if his clock had rung.

B. If Hung' clock hadn't rung, he wouldn't gone to school late.

C. If Hung's clock didn't ring, he would go to school late

D. Hung wouldn't go to school late if his clock didn't ring.