6. The math problem is so _______ that I can’t figure out the answer by myself.
(A) complicated
(B) fashionable
(C) reluctant
(D) passionate
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統計: A(431), B(14), C(26), D(13), E(0) #2556012
統計: A(431), B(14), C(26), D(13), E(0) #2556012