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Allpassengersareexpectedtofastentheseatbeltswhentheplanetakesoffandlands.[]A.onaboardB.onboardC.ontheboardD.onboards
题目详情
| All passengers _____ are expected to fasten the seat belts when the plane takes off and lands. |
| [ ] |
| A. on aboard B. on board C. on the board D. on boards |
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答案和解析
| B |
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