There used to be an old city here, which was （)under the river about 2000 years ago.A、

It__this way.

A、 used to do

B、used to be done

C、is used to do

D、is used to doing

A.are used to

B.are used to be

C.used to be

D.used to being

A.are used to

B.are used to be

C.used to being

D.used to be

A.is used to be

B.used to be

C.is used to being

D.used to being

A.are used to

B.used to

C.use to

D.were used to

A.is used to producing

B.is used to produce

C.used to produce

D.used to producing

She ______ sit-ups before sleep, but not now.

A、used to do

B、was used to

C、used

D、used to

A.used to live, didn't be used to

B.are used to living, didn't use to

C.used to live, weren't used to

D.used to living, usedn't to

A. used to be

B. use to be

C. used be

A.used to play

B.used to playing

C.used to be playing