It _______ your ________ three miles.

问题描述:

It _______ your ________ three miles.
means…to walk
means…walking
subjects…walking
subjects…to walk 选哪个,

means…walking
means在这表示意味着.
subject to 表示受限于,服从于,受
your后面要用名词形式.所以用walking
mean to do打算
mean doing象征,意味着