Can you imagine the difficulty that he had _____ the problems?

A. to work out
B. work out
C. worked out
D. working out
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科目：高中英語 來源：0104 月考題 題型：單選題

Can you imagine the difficulty that he had _____ the problems?
[     ]
A. to work out
B. work out
C. worked out
D. working out

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