问题
选择题
．-----Tommy is planning to buy a car.
----I know .By next month, he______ enough for a used one.
A． saves
B．saved
C．will save
D．will have saved
答案
答案：D
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。