A.died | B.will die | C.has been died | D.has been dead |
A.know | B.have known | C.knew | D.have been known |
A.spend | B.had spent | C.have spent | D.will spend |
A.are operating | B.were operating | C.operate | D.operated |
A.is | B.will be | C.was | D.has been |
A.do | B.have to | C.have to speak | D.must to |
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