问题
选择题
By the time he was twelve, Edison _____ to make a living by himself. [ ]
A. would begin
B. has begun
C. had begun
D. was begun
答案
答案：C
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By the time he was twelve, Edison _____ to make a living by himself. [ ]
A. would begin
B. has begun
C. had begun
D. was begun
答案：C