题目内容：

to plant the tree,we must dig__.A.a hole three feet deep B.a three-feet-deep hole
to plant the tree,we must dig__.
A.a hole three feet deep B.a three-feet-deep hole
选什么?为什么不选另一个?
求详解

优质解答

觉得几位的回答都不正确
a three-foot-deep hole
一个三尺深的坑,这里的foot要用单数形式
因此要用
A. a hole three feet deep
要植树,我们必须挖三尺深的坑.
a hole three feet deep这里是后置定语,没错的