甲、乙两人从4门课程中各选修2门。则甲、乙所选的课程中至少有1门不相同的选法共有
A.6种B.12种C.30种D.36种
上一篇 When are the visitors excepted to ask questions?A During the lunch hour . B. After th
下一篇 I haven’t seen Sara since she was a little A.hearing B.strength C.recogeniting D.measur
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