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17. For a long time, scientists have trouble explaining how young children can learn the grammatical rules and sounds _______ to communicate in words.
(A) require
(B) requiring
(C) required
(D) requires

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10
 【站僕】摩檸Morning：有沒有達人來解釋一下?
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YCC 小一上 (2022/03/03):

For a long time, scientists have trouble explaining how young children can learn the grammatical rules and sounds which is required to communicate in words.

黃色是被省略掉的，應該吧...


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我一定要上岸 小一上 (2022/06/03):

在此省略關代that/which are

the grammatical rules and sounds是兩件事，所以要用are

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uu(已上榜) 高三下 (2024/04/06):
For a long time, scientists have trouble explaining how young children can learn the grammatical rules and sounds (which are) required to communicate in words.
 
長期以來，科學家很難解釋幼兒如何學習語言溝通所需的文法規則和聲音。
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17. For a long time, scientists have tro..-阿摩線上測驗