Question

We _____ live in a small flat but last year we bought a house.

A．would

B．had to

C．used to

D．ought to

Answer 1

C

考查情态动词：A. would过去常常，B. had to  不得不，C. used to 过去常常，（现在不这样）D. ought to应该，句意是：我们过去住在小公寓，但现在我们买了大房子。选C。