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. As a teacher, he has never given his students so difficult a problem ____ they can’t work out.

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favour    kindness    help    benefit  
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in the Mid-term English Exam. -I can see that only a few students for it. A. has he worked; has the teacher praiseD.    has he worked; the teacher has praiseD.    he has worked; the teacher has praise   D. did he work; has the teacher praiseD.  
has    hasn’t    did    didn’t  
favor    deed    help    value  
favor    deed    help    value  
No he did never go there    No, he has never gone there    No, he never was there    No, he's never been there
  
is this the first time he has lied  this is the first time he has lied  is this the first time has he lied  this is the first time he is lying  
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