选择题( 说明理由 )
1: This kind of pot is ( ) keeping tea hot.
A: used in B: used for C: used to
2: --( ),where are you going?
--I'd like to go to the library.
A: By the way B: In this way C: On the way
3: The TV play ( ) for ten minutes when I turned on the TV.
A: had been on B: had started C: has been on