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
问题描述：
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
答
C。
我需要挖一个3尺深的洞来种树
祝你学习进步。
答
c答案就是
答
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
答
C对的，是个合成形容词，用来修饰后面的名词的