24. If he wants to be a great baseball player,the first thing he should do is _____his skills.
(A)realize
(B)progress
(C)increase
(D)sharpen
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統計: A(2), B(55), C(72), D(67), E(0) #1592234
統計: A(2), B(55), C(72), D(67), E(0) #1592234