The river______ are covered with trees i
题型:选择题
问题:
The river______ are covered with trees is polluted.
A.of which the banks
B.whose banks
C.the banks of which
D.A,B,C are right
The river______ are covered with trees is polluted.
A.of which the banks
B.whose banks
C.the banks of which
D.A,B,C are right