阿摩線上測驗
33. The beneficial effects of daydreaming _____.
(A) are unknown
(B) are doubtful
(C) have been shown by experiments
(D) have not yet been proven
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統計： A(4), B(13), C(228), D(4), E(0) #908343
統計： A(4), B(13), C(228), D(4), E(0) #908343
