问题补充：
The city library is on Green Street. Youtake a bus. It’s only aboutwalk.
A. need to, five minutes’
B. may, five minutes
C. don’t have to, five minutes’
D. can, five—minute
答案：
A. need to, five minutes’
B. may, five minutes
(答案→)C. don’t have to, five minutes’
D. can, five—minute
解析：句意：城市的图书馆在格林大街，你没有必要乘公交车，步行大约只有五分钟的路程。don’t have to 没有必要，five minutes’五分钟的，故选C。
