it is normal for parrots to talk, Einstein, a small bird, is unusual in that whenever she hears a new word or sound, she repeats it over and over until she masters it.
A．AsB．WhenC．While　　D．Since
選C。考查狀語從句。句意: 盡管鸚鵡說話是正常的, Einstein, 一只小鳥, 是非同尋常的, 因為每當她聽見一個新單詞或者聲音的時候, 她總是重復說直到掌握。while盡管; as因為; when當……的時候; since既然。
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