来自廖振松的问题
---formanyyears,theastronautsuddenlybecamefamous.a,havingignoredhimb,tobeignoredc,tohavebeignoredd,havingbeenignored
---formanyyears,theastronautsuddenlybecamefamous.
a,havingignoredhim
b,tobeignored
c,tohavebeignored
d,havingbeenignored
