By the time I arrived at the airport, she_____ for New Zealand.
A. would be leaving B has left     C will have left       D had left
D

試題分析：考查時態(tài)。By到…時為止；該連詞與完成時連用；連詞by到…時為止；該詞經(jīng)常與完成時連用，如果后面是將來的時間，就使用將來完成時。本題by后面使用了過去時arrived，說明后面的主句使用過去完成時。句意：到我到機場的時候，她已經(jīng)啟程去了新西蘭了。故D正確。
點評：連詞by到…時為止；該詞經(jīng)常與完成時連用，如果后面是現(xiàn)在的時間，句中就使用現(xiàn)在完成時；如果后面是過去的時間，就使用過去完成時；如果后面是將來的時間，就使用將來完成時。
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