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 Work on Rome’s Palatine Hill has turned up a series of discoveries, including____ might be the underground cave .

   A. what          B. which          C. that             D. while    

Work on Rome’s Palatine Hill has turned up a series of discoveries, including        might be the underground cave .

   A. what          B. which          C. that             D. while  

. Work on Rome’s Palatine Hill has turned up a series of discoveries, including        might be the underground cave .

   A. what          B. which          C. that             D. while  

Work on the new railway will be ___________ (完成) at the end of next year.

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Work on Rome’s Palatine Hill has turned up a series of discoveries, including____ might be the underground cave .