问题标题：
【weneedtodiga()holetoplantthetree.A.ThreefeetdeepB.threefootdeepC.three-feet-deepD.three-foot-deep】
问题描述：
weneedtodiga()holetoplantthetree.
A.ThreefeetdeepB.threefootdeepC.three-feet-deepD.three-foot-deep
代英明回答：
D.在句中作定语数字+单位（单数）+形容词
就如threeyearsold是表语
three-year-old是定语
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