题目

根据短文内容，请将单词填写在题号对应的横线上。 Taking a taxi in a certain Eastern European country can be a shocking experience. is said that some taxi drivers have metal wires stuck into the passenger seats. And a button is pushed, the seat will give you electric shock. These taxi drivers don't do this fun. They do it to tourists argue about the ridiculous(可笑的，荒谬的) fares they charge. Some drivers charge as much ten times the legal fare. They have a secret switch which makes the meters run faster. If the tourists refuse to pay, are really in for a sh Does the way you thought of ________ the river water make any sense? [　　] A． cleaning B． to clean C． how to clean D． being clean