He didn't know which room ____.
A. they lived
B. they lived in
C. did they live
D. did they live in
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用“格物致知”表述实践出真知的概念出自中国古代的《______》一书
对科学和技术的生态批判中最具有影响的人物和组织是雷切尔？卡逊和______俱乐部
The doctor ____ is leaving for Africa next month.
A. the nurse is talking to him
B. whom the nurse is talking
C. the nurse is talking to
D. who the nurse is talking
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