I hear that Jason is planning to buy a new car.I know. By next month he enough f

问题补充：

--- I hear that Jason is planning to buy a new car.

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

A. has saved

B. saves

C. will be saving

D. will have saved

答案：

A. has saved

B. saves

C. will be saving

(答案→)D. will have saved

解析：句意为：---我听说Jason正计划买一辆新车。---我知道的，到下个月为止，他就攒够了钱买一辆二手的了。A现在完成时，表示已经可以买了；B一般现在时，表示经常性，习惯性；C将来进行时，表示将来的某个时候正在进行的动作；从题意可看出是不符合的。到下个月的时候是攒够了，将来完成时的意思是到将来的某个时候要完成的动作，故答案应为D。