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We have to wait     the light turns green. A. when B. while C. until D. if

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wait  to be waiting  to wait  waiting  
to be waiting    to have been waiting    to have waited    to wait  
can    may    have to    need  
can    may    have to    need  
needn't    shouldn't    couldn't    mustn't  
needn't wait  shouldn't have waited  mustn't wait  mustn't have waited  
needn't    mustn't    couldn't    shouldn't  
needn't    mustn't    couldn't    shouldn't  
across;needn't  across;mustn't   through;can't  through;mustn't  
needn't    mustn't    couldn't    shouldn't  
the wait could not be longer    the wait can not be long   the wait could not be long    the wait could not be longest  
across;needn't  across;mustn't   through;can't  through;mustn't  
must    can    need    may  
mustn’t have waited    shouldn’t have waited    mustn’t wait    needn’t wait  
have  have had   had  will have  
needn`t wait    should have waited    needn`t have waited    didn`t need to wait  
didn’t need to wait    needn’t have waited    must have waited    couldn’t have waited  

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