By the time he realizes he ______ into a trap, it’ll be too late for him to do a
题型：不详难度：来源：
By the time he realizes he ______ into a trap, it’ll be too late for him to do anything about it.| A．walks | B．walked | C．has walked | D．had walked |
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答案
| C |
解析
| By the time这里是连词，引导时间状语从句，根据主句的时态是将来时，推断出从句是一般现在时代替一般将来时。 |
举一反三
When Nancy was at college, she ____ three foreign languages, but I am surprised to find that she ____ all except a few words of each.| A．spoke; had forgotten | B．had spoken; had forgotten | | C．spoke; has forgotten | D．had spoken; has forgotten |
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Don’t interrupt me. I ________ letters all morning and have only finished five.| A．write | B．have written | C．have been writing | D．am writing |
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The meeting for two hours,but they still any agreement.| A．has been going on;haven’t reached | | B．has been going on; haven’t been reached | | C．was going on; haven’t reached | | D．was going on; haven’t been reached |
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The subway __________in our city, and I’m sure there will be fewer traffic jams in the future.| A．is building | B．is built | C．is being built | D．will build |
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I want to buy that kind of cloth because I _____ the cloth _____ well.
A have told; washed B have been told; is washed
C was told; washed D have been told; washes |
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