Being a teacher always encouraging students to think for themselves, I won"t tel
题型：不详难度：来源：
Being a teacher always encouraging students to think for themselves, I won"t tell them answers until they __________ on a math problem for more than an hour.| A．have worked | B．will have worked | | C．will have been working | D．had worked |
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答案
| A |
解析
试题分析：考查时态：句意：做老师总是鼓励学生独立思考，直到他们这道数学题算了一个多小时我才告诉他们答案。主句是一般将来时，从句用一般现在时或现在完成时代替将来时，或将来完成时。选A。
点评：这题考查的是时间条件状语从句的时态问题，此类的状语从句不能用将来时，用一般现在时或现在完成时代替将来时，或将来完成时。 |
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The country life he was used to ____ greatly in the past decade． | A．change | B．has changed | C．changing | D．have changed |
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I called him many times, but I didn’t get through, maybe his mum _ on the phone all the time．| A．talked | B．was talking | C．has talked | D．had talked |
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The London 2012 Olympic Games marks the third time that London ______ the right to host the modern Olympics.| A．had had | B．has | C．had | D．has had |
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