题目
题型:同步题难度:来源:
B. has begun
C. had begun
D. was begun
答案
核心考点
试题【By the time he was twelve, Edison _____ to make a living by himself. [ ]A. 】;主要考察你对过去完成时等知识点的理解。[详细]
举一反三
A. had visited
B. has visited
C. will visit
D. visited
A. has written
B. will write
C. had written
D. wrote
B. was taken off
C. will take off
D. is taking off
[ ]
B. had arrived
C. had been
D. came
B. has been on
C. had begun
D. has begun
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