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

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：考查动词时态：句意：--汤米计划买车。 --我知道，下个月底之前，他会有足够的前买辆二手车。根据题意，表示将来时，在D和C之间选择，D是将来完成时，C 是一般将来时，根据短语By next month 可知是“将来完成时”的标志，因此选D