3. In the winter time, it is very common to see people killed by invisible gases due to the mishandling of their heater.
(A) invalid
(B) jointly
(C) hidden
(D) dangerous 

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統計： A(8), B(12), C(73), D(25), E(0) #1203589

詳解 (共 1 筆)

#1307983
原本答案為D,修改為C
(共 13 字，隱藏中）
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