The market isn't far from here .It's only _____ bicycle ride.

问题描述:

The market isn't far from here .It's only _____ bicycle ride.
A.half an hour's B.half an hours' C.half an hour D.one hour and a half

A.half an hour's
首先这里要表示“只有多少小时的车程”,所以要用所有格,排除CD.
然后因为是半个小时,所以用hour不用hours.选A