If it is the best thing to do ,it cannot be

问题描述:

If it is the best thing to do ,it cannot be
You ( ) walk for miles and miles among the hills without meeting anyone.A.mustB.needC.mayD.should.
选择哪一个呢?为什么?(⊙_⊙)?

要结合语境,可以用B,C,表推测,“你可能走很远也看不到一个人”,也可以用A,D“要想不遇到任何人,要走好远”,