we need to dig a ( )hole to plant the tree.A.Three feet deep B.three foot deep C.three-feet-deep D.three-foot-deep

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we need to dig a ( )hole to plant the tree.
A.Three feet deep B.three foot deep C.three-feet-deep D.three-foot-deep

D.在句中作定语数字+单位(单数)+形容词
就如three years old是表语
three-year-old是定语

C对的,是个合成形容词,用来修饰后面的名词的

c答案就是

C。
我需要挖一个3尺深的洞来种树
祝你学习进步。