要使用产品样品或广告样本这类辅助用具来进行访问的调查项目适用于（）的面谈访问方式
A留置访问
B邮寄访问
C电话访问
D个人访问
参考答案：D
When asked why he went there,he said he was sent there___for a space flight.
A．training
B．being trained
C．to have trained
D．to be trained
闰盘
