107. Passengers are reminded to keep their seatbelts fastened_______the captain turns off the safety sign.
(A) as if
(B) unless
(C) without
(D) regarding

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統計： A(3), B(15), C(3), D(3), E(0) #3823407

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#7298360
乘客被提醒要繫好安全帶，_______ ...
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