Theriver, thebankarecoveredwithtrees,isverylong.A...

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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*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*为C。