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B Trees should only be pruned (修剪) when there is a good and clear reason for doing so and, fort...

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If not   If so   If no so   If don’t  
would have grown    would grow    should have grown    might grow  
If not  If so   If not so  If don’t  
water  be watered  watering  be watering  
should plant    should be planting    should be planted    should be plant  
will plant  should plant   should planted  should be planted  
even    just    alone    only  
will plant    should plant    should be planted    must plant  
planted    are planted    were planted    will be planted  
The American PR industry should develop global communication technologies.  People involved in PR should avoid suing the word "foreign".  American PR companies should be more internationally minded.  People working in PR should be more fluent in foreign languages.  
The American PR industry should develop global communication technologies.  People involved in PR should avoid suing the word “foreign”.  American PR companies should be more internationally minded.  People working in PR should be more fluent in foreign languages.  

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