Judging from his _____ look, he has found the key to _____ the difficult problem.

A. excited, solving
B. excited, solve
C. exciting, solving
D. exciting, having solved
A
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科目：高中英語 來源：0110 期末題 題型：單選題

Judging from his _____ look, he has found the key to _____ the difficult problem.
[     ]
A. excited, solving
B. excited, solve
C. exciting, solving
D. exciting, having solved

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