By the time we reach that page, we ___________ twenty lessons of the book.
A.will study
B.will have studied
C.would study
D.have studied
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B解析这题考查时态,时间是:By the time+时间状语从句,“到…时间为止”,主句用相应的过去时,因为时间状语从句用的是一般现在时代替将来时,所以主句用将来完成时。句意是:到我们学到那一页为止,我们将已经学了20课了。选B。