阿摩線上測驗
10. Hydrogen is a ______ of all organic compounds.
(A) competition
(B) compartment
(C) company
(D) component
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統計： A(0), B(0), C(0), D(7), E(0) #3257502
統計： A(0), B(0), C(0), D(7), E(0) #3257502
