— Tom is planning to buy a car. — I know. By next month he enough for a used one.A. saved

问题补充：

— Tom is planning to buy a car.

— I know. By next month, he enough for a used one.

A. saved

B. has saved

C. would save

D. will have saved

答案：

A. saved

B. has saved

C. would save

(答案→)D. will have saved

解析：考查时态：句意：--汤姆计划买辆车。--我知道，到下个月底为止，他就可以攒足够的钱买一辆二手车了。时间是by next month和将来完成时连用，选D。