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A guy wants to go to a store, a bank, a bookstore, and a shoe shop. It does not matter which one he goes first, but he must go to a bank before he goes to a shoe shop. How many different possible trip arrangements can he make?
A、6.0
B、10.0
C、12.0
D、18.0
E、24.0
答案：C
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老师，请问这个为什么不是3*2*1呢？就是bank和shoe shop看成一个
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