问题描述：
After Tim finished his homework,he could play computer games.
保持句意不变：
Tim ___ play comuter games ___ he finished his homework.
Tim could play computer games when he finished his homework.这样是否正确
保持句意不变：
Tim ___ play comuter games ___ he finished his homework.
Tim could play computer games when he finished his homework.这样是否正确
问题解答：
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