1 It was so obvious that he was just trying to butter ______his boss in order to get a raise.
(A) at
(B) on
(C) over
(D) up
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統計: A(7), B(36), C(9), D(52), E(0) #2886333
統計: A(7), B(36), C(9), D(52), E(0) #2886333