Question

Don't worry. It's only fifteen ________ walk from here to the airport.

1. A.
   minute
2. B.
   minutes'
3. C.
   minutes
4. D.
   minute's

Answer 1

B
此题考查名词的所有格形式。fifteen minutes是复数形式，以s结尾的复数名词的所有格形式只在其后加上“'”而不再加s。