问题补充：
．-----Tommy is planning to buy a car.
----I know .By next month, he enough for a used one.
Asaves
B. saved
C. will save
D. will have saved
答案：
A. saves
B. saved
C. will save
(答案→)D. will have saved
解析：考查时态题。will have saved是将来完成时，用来表示在将来某一时间以前已经完成或一直持续的动作。标志时间状语是By next month，截止下个月。故选D。
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