问题
选择题
We _____ live in a small flat but last year we bought a house.
A．would
B．had to
C．used to
D．ought to
答案
答案：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。
