Kids don't learn their native language consciously, ________ they become fluent in it very fast.

A．but B．and

C．for D．so

 

A

【解析】A 考察并列連詞。句義：小孩子并沒有意識去學習自己的母語，但他們很快就熟練了。上下文之間存在這轉折關系。故A正確。

 

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