I didn"t manage to do it ________ you had explained how.[ ]A. until B. unl
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I didn"t manage to do it ________ you had explained how. |
[ ] |
A. until B. unless C. when D. before |
答案
A |
举一反三
The film is really wonderful.It"s such a long time ________ I enjoyed myself so much. |
[ ] |
A. when B. before C. as D. since |
As is known, ________we know some basic knowledge concerning AIDS, we can protect ourselves from being infected. |
[ ] |
A. as far as B. if only C. so long as D. unless |
________ everyone else wouldn"t go to the mountain area, he went without a second thought. |
[ ] |
A. As long as B. While C. Where D. In spite of |
—The plane is due to take off at 7:50 from the airport. —________ we fail to arrive there in time? —Try to take another flight then. |
[ ] |
A. What if B. As if C. Even if D. Only if |
He is only too ready to help others, seldom, ________ refusing them when they turn to him. |
[ ] |
A. if never B. if ever C. if not D. if no |
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