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Allpassengersareexpectedtofastentheseatbeltswhentheplanetakesofforlands.[]A.ontheboardB.onboardC.onboardsD.onaboard
题目详情
| All passengers________are expected to fasten the seat belts when the plane takes off or lands. |
| [ ] |
| A. on the board B. on board C. on boards D. on a board |
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答案和解析
| B |
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