By the time you come back, your aunt ______ for Nanjing to attend a meeting.  
A．will leaveB．leavesC．leftD．will have left
D
考查時態(tài)，by+時間狀語，句子通常用完成時態(tài)，根據(jù)從句By the time you come back,可知指將來，所以用將來完成時。選D。
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