阿摩線上測驗
15.In a formal paper, it is compulsory to use footnotes each time a source is quoted.
(A)acceptable
(B)sensible
(C)supplementary
(D)mandatory
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統計： A(17), B(14), C(20), D(198), E(0) #1412708
統計： A(17), B(14), C(20), D(198), E(0) #1412708
