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All passengers are expected to fasten the seatbelts when the plane takes off and

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All passengers are expected to fasten the seatbelts when the plane takes off and

All passengers        are expected to fasten the seatbelts when the plane takes off and lands.

A. on the board      B. on board    C. on a board  D. on boards

试题答案

B

解析:

略

标签：fastentoseatbeltsthepassengers

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