(单选题) By the time he was 12, Edison ______ to make a living by himself. ( )(本题3.0分) A、 would begin B、 has begun C、 had begun D、 was begun

(单选题) By the time he was 12, Edison ______ to make a living by himself. ( )(本题3.0分)
A、 would begin
B、 has begun
C、 had begun
D、 was begun

出自：大连工业大学-大学英语2

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