21. The village is far away from here indeed. It’s walk.A. a four hourB. a four hour’sC.

问题补充：

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’

答案：

A. a four hour

B. a four hour’s

C. a four-hours

(答案→)D. a four hours’

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