(Passengers) (are warned) not to (get off) a bus while (moving).

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问题 (Passengers) (are warned) not to (get off) a bus while (moving).

选项 A、Passengers
B、are warned
C、get off
D、moving

答案D

解析 主谓一致错误,应改为it is moving。因为主句的主语是passengers,而moving的主语是 bus,所以不能省略。
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