13.I_the book by the time you come back next week.A have finished B shall have finished C finish D

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13.I_the book by the time you come back next week.A have finished B shall have finished C finish D
13.I_the book by the time you come back next week.A have finished B shall have finished C finish D

13.I_the book by the time you come back next week.A have finished B shall have finished C finish D
B
by the time ...解为到...时 引导的时间状语从句 指示的动作现在表将来 所以主句用将来时 加上
by the time 就用将来完成时shall have finished

B。将来完成时。

A