阿摩線上測驗
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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統計： A(14), B(10), C(99), D(23), E(0) #923641
統計： A(14), B(10), C(99), D(23), E(0) #923641
