By the time he was twelve, Edison _____ to make a living by himself. [ ]A.
题型：同步题难度：来源：
| 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 |
举一反三
| It was the third time that she _____ the History Museum. |
A. had visited
B. has visited
C. will visit
D. visited |
| She said she _____ me five letters in one month. |
A. has written
B. will write
C. had written
D. wrote |
| The plane ______ when we got to the airport. |
| [ ] |
A. had taken off
B. was taken off
C. will take off
D. is taking off |
| He told me that he ________ here for five minutes. |
[ ] |
A. has come
B. had arrived
C. had been
D. came |
| The meeting _______ by the time I got there yesterday. |
| [ ] |
A. was on
B. has been on
C. had begun
D. has begun |
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