The boy was having a class when the earthquake broke out in yushu. He could have been kill

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

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