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This is the difficulty they had out this problem. A. working B. to work C. worke

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This is the difficulty they had out this problem. A. working B. to work C. worke

This is the difficulty they had _______ out this problem.

A. working B. to work　 C. worked D. to be worked

 

试题答案

A

标签：theyhadoutdifficultythis

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