Smallpox a kind of disease has now died .A. outB. awayC. offD. down

问题补充：

Smallpox, a kind of disease, has now died .

A. out

B. away

C. off

D. down

答案：

(答案→)A. out

B. away

C. off

D. down

解析：die out “灭绝，消失”。die away“渐息”；die down“平息”；die off “(花、草)枯死”。