問題詳情：
The baby bird is at the stage ________ it is ready to leave the nest.
A．that B．which C．when D．what
【回答】
C [考查定語從句。由語境可知，小鳥到了離開鳥窩的時間了。先行詞爲stage，意爲“階段”，定語從句it is ready to leave the nest中缺少時間狀語，故用關係副詞when作定語從句的時間狀語。]
知識點：定語從句
題型：選擇題
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