As ( ),they were waiting for us at the airport.A.plan B.plannedAs ( ),they were waiting for us at the airport.A.plan B.plannedC.planning D.being planned请问为什么选B

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As ( ),they were waiting for us at the airport.A.plan B.plannedAs ( ),they were waiting for us at the airport.A.plan B.plannedC.planning D.being planned请问为什么选B
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As ( ),they were waiting for us at the airport.A.plan B.plannedAs ( ),they were waiting for us at the airport.A.plan B.plannedC.planning D.being planned请问为什么选B
As ( ),they were waiting for us at the airport.A.plan B.planned
As ( ),they were waiting for us at the airport.
A.plan B.planned
C.planning D.being planned
请问为什么选B

As ( ),they were waiting for us at the airport.A.plan B.plannedAs ( ),they were waiting for us at the airport.A.plan B.plannedC.planning D.being planned请问为什么选B
as planned 是固定短语,事情只能是被计划,要用动词+ed形式.