---Why do the people decide these days?-Because there’s not much to do. A. visit B. to

问题补充：

---Why do the people decide these days?

---Because there’s not much to do.

A. visit

B. to visit

C. not visiting

D. not to visit

答案：

A. visit

B. to visit

C. not visiting

(答案→)D. not to visit

解析：联系下文，因为没有什么可做的。可知上文句意为：为什么人们决定这些日子不去参观了？不定式做宾语表示具体的将要进行的动作，结合语境可知选D。