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最佳答案：甲没被选中时：第一步：从剩下的4人中选3人 ：C(4,3)=4第二步：为3个人分配工作：三个人从事工作无限制,即有 A(3,3)种方案,下面具体描述一下：第一个
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最佳答案：What were you doing at that time?They were having a meeting at 4p.m. yesterday a
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最佳答案：1.what were you doing at 9 o'clock last Sunday? I was sleeping.2.The boy was wal
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最佳答案：What were you doing when the teacher came in?I was talking with my friend.What w
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最佳答案：When others why so many skills, he said a word which I shall never forget, he sa
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最佳答案：your letter touched me very much.he doesn't care/mind teacher‘s criticism.TOM pr
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最佳答案：自己翻译的,不是机器.When a moth bites your lips,do you keep silence or scream?Why is it l
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最佳答案：In fact,no one asked them to do something on the first day of the semester.When