A survey was conducted in Shanghai interviewees were asked if they wanted to be a factory

问题补充：

A survey was conducted in Shanghai interviewees were asked if they wanted to be a factory worker.

A. when

B. whether

C. that

D. where

答案：

A. when

B. whether

C. that

(答案→)D. where

解析：考查定语从句。先行词in Shanghai为下文逻辑地点状语，故选D。