问题
选择题
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
答案
答案：B
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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
答案：B