阿摩線上測驗
31 Because the blood ____to supply enough oxygen to his brain, he feels dizzy quite often.
(A) begins
(B) fails
(C) pays
(D) flows
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統計： A(31), B(175), C(21), D(77), E(0) #763850
統計： A(31), B(175), C(21), D(77), E(0) #763850
