问题
选择题
By the end of last year they _____ thousands of orange trees on the mountains. [ ]
A. had planted
B. have planted
C. were planting
D. would plant
答案
答案：A
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By the end of last year they _____ thousands of orange trees on the mountains. [ ]
A. had planted
B. have planted
C. were planting
D. would plant
答案：A