已知变量a、b已被赋值，要交换a、b的值，采用的算法是（ ）
| A．a =" b," b =" a" | B．a =" c," b =" a," c =" b" |
| C．a =" c," b =" a," c =" a" | D．c =" a," a =" b," b = c |
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已知变量a、b已被赋值，要交换a、b的值，采用的算法是（ ）
| A．a =" b," b =" a" | B．a =" c," b =" a," c =" b" |
| C．a =" c," b =" a," c =" a" | D．c =" a," a =" b," b = c |
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