No chicken or duck in the supermarket since the first case of H7N9 was reported dead.
A. has been sold
B. was sold
C. is sold
D. are sold
网友回答
(答案→)A. has been sold
B. was sold
C. is sold
D. are sold
解析：考查时态：句意：自从第一个H7N9病例被报告后，没有人吃鸡鸭。和since引导的时间状语从句连用，主句的谓语是现在完成时，No chicken or duck和sell是被动关系，用现在完成时的被动，选A。