No one can imagine the difficulty he had his son to get rid of the habit of playing comp

问题补充：

No one can imagine the difficulty he had his son to get rid of the habit of playing computer games.

A. persuading

B. to persuade

C. persuaded

D. persuade

答案：

(答案→)A. persuading

B. to persuade

C. persuaded

D. persuade

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