问题补充：
——Tommy is plannning 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。根据时间状语by next month可确定，此处应用将来完成时，表示“到下个月为止，他将攒够买一辆二手车的钱”。
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