問題詳情

39. When the general emergency alarm is sounded, which consists of seven short blasts andon_______e blast, all crew members have to go to their assembly station.
(A) prolonged 。
(B) prolong
(C) long
(D) longed

參考答案

答案:C
難度:適中0.5
統計:A(2),B(0),C(2),D(0),E(0)

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