Electronic business transactions

Electronic business transactions ______（conduct） in full or in part in a wireless environment are referred to as mobile commerce.
【正确答案】：conducted
【题目解析】：一个句子中只能有一个谓语动词，由于句中已经有谓语动词are referred to，所以前面要用非谓语动词。transaction（交易）与conduct之间是被动关系，所以用过去分词。