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题目内容
（河北建筑工程学院-建筑学-大学英语1）
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
A. complain
B. to complain
C. complaining
D. complained
参考答案
