1.Fiveyears______sincewemetlast.
A.havepassed
B.haspast
C.haspassed
D.havepasted
2.Onethirdofthepopulationinourcity______farmersinthepast
A.are
B.were
C.is
D.was
请大致讲讲,我看的答案是C,B(我觉得相当不准)