网址：http://m.1010jiajiao.com/timu3_id_2399546[举报]
Every morning Mr. Smith takes a _______ to his office.
A. 20 minutes’ walks B. 20 minute’s walk
C. 20-minutes walk D. 20-minute walk
Every morning Mr．Smith takes a ________ to his office．
A．20 minutes' walks
B．20 minute's walk
C．20-minutes walk
D．20-minute walk