阿摩線上測驗
2 John always tries to outdo others; he works day and night in order to stay _____ top and be competitive.
(A) in
(B) on
(C) for
(D) over
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統計： A(6), B(9), C(0), D(0), E(0) #2333657
統計： A(6), B(9), C(0), D(0), E(0) #2333657
