单选题 When catching an airplane, you'd better be earlier, and therefore you can avoid the frustration of arriving at the very moment when the plane is taking off and ______ unable to get on it.
  • A. be
  • B. are
  • C. being
  • D. were
【正确答案】 C
【答案解析】[解析] being unable to get on it与arriving at the very moment...并列，作介词of的宾语。