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。名詞或代詞+關係代詞whom / which可以引導非限定*定語從句。表示部分與整體的關係，作用相當於whose+名詞，of which the bank =the bank of which = whose bank, 因此*為C。