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(3.00分)They have already started their work.(改为否定句) They    started their work   .

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yet; already  already; yet  yet; yet  already; already  
A. had already been on    had already begun    have already been on    have already begun  
The black hole could tear apart the star.  The black hole could trigger a nuclear explosion in the star.  The black hole could dwindle its size considerably.  The black hole could devour the star.  
The black hole could tear apart the star.  The black bole could trigger a nuclear explosion in the star.  The black hole could dwindle its size considerably.  The black hole could devour the star.  
yet; yet    already; already    yet; already    already; yet  
got    get    had got    have got  
if I have already got well    whether I had already got well   whether have I already got well    if had I already got well  
yet,already   already, yet    yet, yet    already,ever  
The star’s matter will move further away from by the black hole.  The black hole’s matter will heat up.  The torn star’s matter will swirl into the black hole.  The black hole’s matter will release ultraviolet light and X-rays.  
yet,yet   already,already   already,yet  yet,already  
the sun is the heaviest star in the universe.  a star in the sky might have an invisible partner.  two black holes are dragged towards each other.  the mass of a star is equal to that of its companion.  
to have left  to leave  to have been left  to be left  
  A. had already been on    had already begun      have already been on    have already begun  
A. had already been on    had already begun    have already been on    have already begun  
yet; already    already; yet    just; already    already; before  
No nuclear explosion would be triggered inside the star.  The star would be destroyed completely.  Much of the star’s matter thrown by the explosion would be beyond the black hole’s reach.  The black hole would completely devour the star.  
No nuclear explosion would be triggered inside the star.  The star would be destroyed completely.  Much of the star’s matter thrown by the explosion would be beyond the black hole’s reach.  The black hole would completely devour the star.  
to have left  to leave  to have been left  to be left  
That’s ok    I was looking forward to seeing him.    Forget it    It doesn’t matter  

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