When _____ about one of the biggest concerns today, many citizens mentioned the sharp rise in housin...
2022-11-20 15:33:05 163次 2015届北京市高二下学期期中考试英语卷（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
When _____ about one of the biggest concerns today, many citizens mentioned the sharp rise in housing price.
A. askingB. to askC. askedD. having asked
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