问题：
[单选题]已知y1（x）与y2（x）是方程y″+P（x）y′+Q（x）y=0的两个线性无关的特解，Y1（x）和Y2（x）分别是是方程y″+P（x）y′+Q（x）y=R1（x）和y″+P（x）y′+Q（x）y=R2（x）的特解。那么方程y″+P（x）y′+Q（x）y=R1（x）+R2（x）的通解应是：（）
A、c1y1+c2y2
B、c1Y1（x）+c2Y2（x）
C、c1y1+c2y2+Y1（x）
D、c1y1+c2y2+Y1（x）+Y2（x）
参考答案：
D
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