A.has not studied biology | B.did study biology |
C.had studied biology | D.studied biology |
A.are to blame | B.is to be blamed | C.are to be blamed | D.is to be blamed |
A.is winning | B.wins | C.has won | D.would win |
A.have decided | B.decided | C.will decide | D.had decided |
A.did you stay | B.have you stayed | C.were you staying | D.have you been staying |
A.worked | B.has worked | C.had worked | D.had been working |
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