单选题 To have a computer without being connected to the Web is like having an old radio when everybody else has a color TV. That helps explain ______ businesses are setting up Net sites even though profits are nowhere to see.
【正确答案】 C
【答案解析】[分析] 结构分析 此处需填一个连接副词来引导后面的名词从句，因表原因，因此用why；连接副词引导的名词从句前后不能再加that；所以C为答案。