阿摩線上測驗
11. As we age, our veins, arteries and vessels lose their flexibility and ability to pump oxygenated blood throughout the body, ______them less efficient.
(A) make
(B) that have made
(C) thereby making
(D) to make
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統計： A(0), B(0), C(1), D(0), E(0) #3367417
統計： A(0), B(0), C(1), D(0), E(0) #3367417
