—How far away is it from here to your school?—It's about ________ .A.half an hourB.half an hour's driveC.half an hour drivesD.half an hour drive
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B解析解题思路：表示时间、距离、重量、地方等的名词，也可以用's构成所有关系．如：ten minutes' walk 10分钟的步行today's newspaper今天的报纸one pound's weight 1磅的重量