问题描述：
27.Buses have routes.They ________ and ________ people at different places on the routes.A.take
27.Buses have routes.They ________ and ________ people at different places on the routes.
A.take on,get off B.pick up,drop off
C.take up; take off D.pick out; drop out
27.Buses have routes.They ________ and ________ people at different places on the routes.
A.take on,get off B.pick up,drop off
C.take up; take off D.pick out; drop out
问题解答：
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