I worked on the problem ____ a long time and I worked it out ____ myself ____ la
题型：专项题难度：来源：
| I worked on the problem ____ a long time and I worked it out ____ myself ____ last. |
| [ ] |
A. for; by; at
B. in; with; on
C. on; by; in
D. for; for; at the |
答案
| A |
举一反三
| A new factory will be set up ___ a year. |
| [ ] |
A. for
B. in
C. after
D. on |
| We will finish the picture a day. |
| [ ] |
A. in
B. on
C. after
D. at |
| The workers had been ____ strike ____ almost a month. |
| [ ] |
A. on; in
B. at; in
C. on; for
D. on; during |
| Mr Brown had lain ____ the ground ____ four hours before they finally found him. |
| [ ] |
A. on; for
B. at; in
C. on; after
D. in; during |
| The teacher is coming back ___ an hour. |
| [ ] |
A. after
B. for
C. in
D. before |
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