5. Before they went into the water, the divers checked their breathing _______ to ensure safety.
(A) apparel
(B) aperture
(C) apparatus
(D) apprentice
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統計: A(56), B(70), C(218), D(54), E(0) #3128932
統計: A(56), B(70), C(218), D(54), E(0) #3128932