问题补充:
The boy was having a class when the earthquake broke out in yushu. He could have been killed if he with his family.
A. had stayed
B. stayed
C. would stay
D. is to stay
答案:
(答案→)A. had stayed
B. stayed
C. would stay
D. is to stay
解析:可联系答.案.网客服索取。