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(211), B(14), C(28), D(6), E(0) #3362546
統計： A(211), B(14), C(28), D(6), E(0) #3362546
