14. On the average, a healthy heart ____ to pump five tablespoons of blood with every beat.
(A) can
(B) must
(C) ought 
(D) should

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統計： A(1), B(19), C(94), D(12), E(0) #2406964

詳解 (共 1 筆)

#4310002
ought to ph.應該，應當
(共 19 字，隱藏中）
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