They __________tennis together when they were at college.

They __________tennis together when they were at college.

题目
They __________tennis together when they were at college.
used to play
were used to play
used to playing
are used to playing
答案
答案:A used to play
used to do sth...
表示以前做什么,现在不做了.
B,C 语法不对.
D 是说 他们现在很习惯于做怎么.但是跟后面的从句表达的时间不符.
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