It is difficult for us to learn a lesson in life ____we’ve actually had that les
题型：不详难度：来源：
It is difficult for us to learn a lesson in life ____we’ve actually had that lesson. | A．until | B．after | C．since | D．when |
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答案
| A。 |
解析
| 由语境逻辑可知，人的一生难以吸取教训的状态一直延续到真正有了教训，因此该空应填until引导时间状语从句。 |
举一反三
He was told that it would be at least three more monthshe could recover and return to work. | A．when | B．before | C．since | D．that |
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he field research will take Joan and Paul about five months; it will be a long time _______ we meet them again. | A．after | B．before | C．since | D．when |
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Many of them turned a deaf ear to his advice, _______ they knew it to be valuable. | A．as if | B．now that | C．even though | D．so that |
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_______,his idea was accepted by all the people at the meeting. | A．Strange as might it sound | | B．As it might sound strange | | C．As strange it might sound | | D．Strange as it might sound |
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I won’t call you, ________ something unexpected happens. | A．because | B．whether | C．unless | D．while |
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