Tommy is planning to buy a carI know. By next month he enough for a used one.A.

问题补充：

--- 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：

A. saves

B. saved

C. will save

(答案→)D. will have saved

解析：本题考查时态。By +时间状语，往往用完成时态，再根据next month可知用将来完成时，选D。