13. With age,the mineral content of human bones decreases,_____them more fragile.
(A) make
(B) and to make
(C) thereby making
(D) which it makes
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兩個句子連接缺連接詞,要將後面句子之動詞...
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With age,the mineral...
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13.With age,the mi...
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題目:隨著年齡增長,人體骨骼的礦物含量...