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(146), B(9), C(20), D(3), E(0) #3362546

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#6280159
偶爾會發生________，因此繫好安全...
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