By the time Fred gets back home his girlfriend for London to study.A. will have leftB. le

问题补充：

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

答案：

(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。