30. If you are trapped under debris during or after an earthquake, tap on a pipe or wall or use a whistle so rescuers can locate you, and shout only as last resort to avoid ________ dangerous amount of dust.
(A)inhaling
(B) inhale
(C) to inhale
(D) being inhaled
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統計: A(332), B(36), C(85), D(52), E(0) #2673792
統計: A(332), B(36), C(85), D(52), E(0) #2673792