By the time Fred gets back home, his girlfriend for London to study.
A. will have left
B. leaves
C. has left
D. will leave
网友回答
(答案→)A. will have left
B. leaves
C. has left
D. will leave
解析： 考查时态。By the time + 一般现在时态表示的是将来，后应用将来完成时态。句意：到弗莱德回到家的时候，他的女朋友将会已经去伦敦学习去了。所以选A。