he table tennis when he was free.A used to play B was used to playingC was used to play D used to playing

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hetabletenniswhenhewasfree.AusedtoplayBwasusedtoplayingCwasusedtoplayDusedtoplayinghetabletenniswhen

he table tennis when he was free.A used to play B was used to playingC was used to play D used to playing
he table tennis when he was free.
A used to play B was used to playing
C was used to play D used to playing

he table tennis when he was free.A used to play B was used to playingC was used to play D used to playing
选A
used to表示过去常常做什么,后接动词原形.
你的问题大意为:过去,当他有空的时候就常常打兵兵球.

A.used to do sth.过去常常做某事