20. The old computer system was fairly complicated to operate _____ the new one is very simple.
(A)however
(B)despite
(C)while
(D)compared to
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統計: A(164), B(66), C(389), D(289), E(0) #1917150
統計: A(164), B(66), C(389), D(289), E(0) #1917150