In the forest we saw some trees---the leaves were black with disease.A of which Bwhose 为什么选B

问题描述:

In the forest we saw some trees---the leaves were black with disease.A of which Bwhose 为什么选B

树的叶子是黑的 “谁的”用whose 所以B
“谁的颜色”中的介词不是of 所以不选A