By the time Fred gets back home, his girlfriend       for London to study.
A．will have leftB．leavesC．has leftD．will leave
A
考查時態(tài)。By the time + 一般現(xiàn)在時態(tài)表示的是將來，后應(yīng)用將來完成時態(tài)。句意：到弗萊德回到家的時候，他的女朋友將會已經(jīng)去倫敦學(xué)習(xí)去了。所以選A。
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