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。
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