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 unlessC though D provided我选的B 难道不对?我不懂,感觉选它意思不通顺啊.

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如题Mostparentsencouragetheirchildrentotakeanactivepartinsocialevents,_____thoseeventsdonotinterferewi

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 unlessC though D provided我选的B 难道不对?我不懂,感觉选它意思不通顺啊.
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.

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 unlessC though D provided我选的B 难道不对?我不懂,感觉选它意思不通顺啊.
大多数家长鼓励他们的孩子参加一些社会实践活动,如果这些活动不影响他们的学习的话.
UNLESS是如果不,除非
PROVIDED是倘若,如果

provided 的用法类似于if，引导一个从句，使用provided(that) 引导从句表示条件时,常表示当事人所希望的条件。
例如 We can sell a lot of computers provided that your price is highly competitive.
这句话的意思是大多数家长鼓励他们的孩子参加一些社会实践活动,前提是如果这些活动不影响他们...

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大多数的家长鼓励他们的孩子积极参加社会活动，前提条件是这些活动不会和他们的学习产生冲突。过去分词引导的独立主格结构，是一种条件状语。

provided 倘若，如果，假若，除非
如果不影响学习，大多数父母都鼓励他们的孩子积极参加社会活动．

我理解这句话的意思是许多父母希望自己的小孩能在社会中有自己的立足之地所以鼓励他们在社会中寻找一些事情去做!而同时又不希望这些事影响到孩子们的学业!
所以选择D逗号后的句子是修饰social events的同谓语!不能用unless来并列句子的！

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权威解释：
译：大多数家长鼓励他们的孩子积极参加社会活动，前提是这些活动不会和他们的学习发生冲突。
这里provided(that)...不是过去分词的用法，而是用作连词(conj).(=on the condition that...，if...)假如, 如果, 倘若..., 在...条件下。也就是说后面要接一个从句，相当于if...条件句的用法，由于that常省略容易误解为过去分词。这里providing(that)...用法意思也是一样的。
当然provided也可以用作过去分词或形容词（adj.预备好的; 由...供给的），后面就不能接从句了。
provided school[英](靠地方税维持的)公立小学校
cash provided by operations 运营现金收入
except as otherwise herein provided 除另有规定外
搭配：provided with... 被提供, 配备有...
unless当然也后接一个条件从句，并且这个条件从句通常为肯定分句形式，因为unless的意思相当于if...not...是“如果不...,除非...”的意思。所以原句中的“not”如果去掉倒是可选B了。大多数家长鼓励他们的孩子积极参加社会活动，除非这些活动会和他们的学习发生冲突。意思基本是一样的。

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provided这个连词有假设的意思

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