The problem is hard but Tom has _____ a good idea to so
| The problem is hard but Tom has _____ a good idea to solve it. |
| [ ] |
| A. caught up B. come up with C. caught up with D. came up with |
可能相似的问题
| The problem is hard but Tom has _____ a good idea to solve it. |
| [ ] |
| A. caught up B. come up with C. caught up with D. came up with |