问题描述：
如题
Most parents encourage their children to take an active part in social events,_____ those events do not interfere with their studies.
A lest B unless
C though D provided
我选的B 难道不对?
我不懂,感觉选它意思不通顺啊.
Most parents encourage their children to take an active part in social events,_____ those events do not interfere with their studies.
A lest B unless
C though D provided
我选的B 难道不对?
我不懂,感觉选它意思不通顺啊.
问题解答：
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