在连续干燥器中，物料进口时的质量流量为G1，含水质量分数为W1，出口时的含水质量分数为W2，则干燥器中物料失去的水分为（）
A. G1（W1- W2）/（1- W2）
B. G1（W1- W2）/（1- W1）
C. G1（W1+ W2）/（1- W2）
D. G1（W1+W2）/（1- W1）
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