30. The software developer worked tirelessly to ______ the application's speed and functionality for a smoother user experience.
(A)elicit
(B)refund
(C)optimise
(D) flash
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統計: A(1), B(0), C(9), D(3), E(0) #3384739
統計: A(1), B(0), C(9), D(3), E(0) #3384739