关于by which和by which time,怎么用?

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查看11 | 回复1 | 2013-10-13 11:44:58 | 显示全部楼层 |阅读模式
2. The average length of labor during which these women received their meperidine was under 12 hours.4. Socially Awkward Situations During Which It Would Be Acceptable to Mess With Texas.5. Fish evolve a longer lifespan by evolving a longer period during which they reproduce.4. Have been fostering for five years, during which...
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