At first Mr.Smith thought his investment in information technology was a waste of money, but finally it ( ).
举一反三
- Mr Smith thought the Century Park was the second ____ in Shanghai.
- Mr Smith, together with his children,______ arrived.
- Mr Jackson has only _____ money in his pocket .
- Hector tells Mrs. Smith she is his first customer.
- Mary dropped in ____ Mr.Smith, but he wasn’t at home, so she went to drop in ____ Mr Smith's office. A: A. on, on B: B. at, at C: C. on. at D: D. at. on