A.to base | B.basing | C.to be based | D.based |
A.improve | B.improving | C.improved | D.be improve |
A.To fail; not to take | B.Having failed; not to take | C.On failing; not taking | D.Failing; not to take |
A.Having shown | B.Being shown | C.To be shown | D.Having been shown |
A.to blame; occurred | B.to blame; occurring |
C.to be blamed; occurred | D.to be blamed; occurring |
A.to proving | B.to proved | C.proves | D.proving |
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