阿摩線上測驗
22 Occasionally, ______ happens unexpectedly, so it's always a good idea to fasten your seatbelt.
(A) turbulence
(B) investment
(C) evaluation
(D) character
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統計： A(708), B(92), C(101), D(22), E(0) #3093540
統計： A(708), B(92), C(101), D(22), E(0) #3093540
