Helen ______ her keys in the office so she had to wait until her husband ______
题型：不详难度：来源：
Helen ______ her keys in the office so she had to wait until her husband ______ home. | A．has left; comes | B．left; had come | | C．had left; came | D．had left; would come |
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答案
| C |
解析
考察时态。根据句意可知，Helen因为先把钥匙丢在了办公室，所以她要等她的丈夫回家。
所以leave发生在had to wait之前，即过去的过去，用过去完成时，第二空是until引导的时间状语从句，从句中用一般过去时表示过去将来。 |
举一反三
---Guess what, we’ve got our visas for a short-term visit to the UK this summer.
---How nice! You ______ a different culture then. | A．will have experienced | B．have experienced | | C．have been experiencing | D．will be experiencing |
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When you begin a sentence with “don’t tell anyone but …” there’s a 90% chance that the
person ______ someone. | A．tells | B．would tell | C．will tell | D．has told |
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The weather forecast says there will be wind from the northwest tonight. That always _____ snow with it at the time of year.| A．brought | B．brings | C．will bring | D．has brought |
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By the time Jack returned home from England, his son_____ from college.| A．graduated | B．has graduated | | C．had been | D．had graduated |
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His sister left home in 1998, and_______ ever since.| A．had not been heard of | B．has not been heard of | | C．had not heard of | D．has not heard of |
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