[单选题]When the writer says that“the long polar night had begun”, what did he mean by “ the long polar night”?
AIn SoutH.Pole, thE.nights A.rE.longer thA.n D.A.ys.
B.In SoutH.Pole, it will remA.in D.A.rk for severA.l months.
C.In SoutH.Pole, therE.A.rE.no
DA.ys.D..In SoutH.Pole, ther
Eis no D.ifferenC.E.B.etween D.A.y night.
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