36. Some problems are relatively simple, others are such complex that there is no way to solve them.
(A)relatively
(B)simple
(C)such
(D)to solve
(E)them
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統計: A(1), B(6), C(19), D(4), E(2) #971106
統計: A(1), B(6), C(19), D(4), E(2) #971106