问题
选择题
After living with his grandparents in the countryside for ten years, the boy returned to the big city ____ his parents worked.
A．which
B．where
C．that
D．when
答案
B
where引导限制性定语从句。
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After living with his grandparents in the countryside for ten years, the boy returned to the big city ____ his parents worked.
A．which
B．where
C．that
D．when
B
where引导限制性定语从句。
表1 1979、2008年我国工业总产值中各种经济成分比重表（％）
| 类别 年份 | 国有及国有控股工业 | 集体工业 | 城乡私营工业 | 其他经济类型工业 |
| 1978年 | 77.6 | 22.4 | ||
| 2008年 | 28.34 | 38.1 | 17.59 | 18.5 |
A．工业结构逐步调整
B．企业管理体制的改革
C．市场经济不断完善
D．经济体制改革的深化