He bought some books in the bookstore and his father him a lot of money.
A. gives
B. will give
C. ought to give
D. must have done
网友回答
A. gives
B. will give
C. ought to give
(答案→)D. must have done
解析：考查情态动词表示推测。句意：他买了很多的书，他的父亲肯定给了他很多的钱。父亲给他钱是在过去发生的事情，故使用“情态动词+have done”表示对过去发生的事情的推测。Must have done一定做了某事；故D正确。