阿摩線上測驗
15. Taking regular vacations is necessary for those who _______________ too much on work.
(A) complicate
(B) concentrate
(C) contain
(D) consist
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統計： A(17), B(54), C(13), D(14), E(0) #573760
統計： A(17), B(54), C(13), D(14), E(0) #573760
