如果要选A ,则是这样. a three- foot-deep hole
three- foot -deep 是复合形容词做定语 (英尺要用单数)
就像a 10-year-old boy 复合形容词做定语
a boy is 10 years old 做表语
而c =a hole which isthree feet deep这里的three feet deep 实际上做了表语
如果要选A ,则是这样. a three- foot-deep hole
three- foot -deep 是复合形容词做定语 (英尺要用单数)
就像a 10-year-old boy 复合形容词做定语
a boy is 10 years old 做表语
而c =a hole which isthree feet deep这里的three feet deep 实际上做了表语