in the Forest we observed some trees___the leaves were Black with.disease Awhere Bof which Cin which Dwhose为什么不选A或C
问题描述：
in the Forest we observed some trees___the leaves were Black with.disease Awhere Bof which Cin which Dwhose为什么不选A或C
答
选B因为是THE LEAVES OF THE TREE即OF WHICHC:LEAVE不是IN THE TREEwhere不是代表介词+which吗嗯？所以of which啊那where不是也可以吗拜托WHERE指地点，TREE是物，不是地点。多做题，就会有语感哦