题目内容：
The boy was allowed A. in case
B. by the time
C. on condition that
D. if only
参考答案：
单选题：The boy was allowed to play computer games _____he finished ..
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- 题目类型：单选题
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A. in case
B. by the time
C. on condition that
D. if only
A. in case
B. by the time
C. on condition that
D. if only
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