21. The village is far away from here indeed. It’s ______ walk.

   A. a four hour                B. a four hour’s     C. a four-hours             D. a four hours’

The village is far away from here indeed. It's ________ walk.

A. a four hour

B. a four hour's

C. a four-hours

D. a four hours'

A. a four hour

B. a four hour's

C. a four-hours

D. a four hours'

 The village is far away from here indeed.It's________walk.

A．a(chǎn) four hour                    B．a(chǎn) four hour's

C．a(chǎn) four hours                  D．a(chǎn) four hours'

21. The village is far away from here indeed. It’s ______ walk.