阿摩線上測驗
6. Dentists tell us that we need only simple dental _ , i.e. regular, correct use of a soft toothbrush and of dental floss, to keep our breath fresh.
(A) requirement
(B) treatment
(C) hygiene
(D) compulsion
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統計： A(23), B(65), C(118), D(0), E(0) #2278433
統計： A(23), B(65), C(118), D(0), E(0) #2278433
