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问题
判断题
尚可喜主动请缨回家
答案
参考答案：
对
选择题
_____ his homework in time, he had to stay up late into the night.
A. Finishing
B. Having finished
C. To finish
D. To have finished
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问答题 简答题
选择连铸二冷喷咀有哪些要求？
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