5. Workers who had lost their jobs left the factory _____ very bitterly about the way they had been treated. A. complain B. to complain C. complaining D. complained

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5. Workers who had lost their jobs left the factory _____ very bitterly about the way they had been treated.
A. complain
B. to complain
C. complaining
D. complained

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西安交通大学自动化原件及其应用