A.made | B.have made | C.had made | D.am making |
A.When was it that | B.When has | C.Has | D.had |
A.had intended | B.intended | C.intending | D.to intend |
A.solving | B.being solved | C.having solved | D.solved |
A.should discuss | B.was discussed | C.being discussed | D.be discussed |
A.would ;knew | B.will ;knows | C.would ;knows | D.will ;knew |
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