单项选择题
A. that B. while C. which D. when
A.to pay for their children’s education B.to get to know more writers C.to set up more bookstores D.to do what they like to do
A.They had to borrow money to keep it going. B.They made just enough to cover all the costs. C.They succeeded in earning a lot of money. D.They failed though they worked har