The river, the bank are covered with trees, is very long.
A. whose B. which
C. of which D. which of
The river, the bank are covered with trees, is very long.
A. whose B. which
C. of which D. which of
C。名词或代词+关系代词whom / which可以引导非限定性定语从句。表示部分与整体的关系，作用相当于whose+名词，of which the bank =the bank of which = whose bank, 因此答案为C。