64 Please keep your seat belt fastened at any time you are seated – in case your flight comes across
unexpected______ .
(A) turbulence
(B) occurrence
(C) monument
(D) installment
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統計: A(152), B(23), C(7), D(8), E(0) #2294712
統計: A(152), B(23), C(7), D(8), E(0) #2294712