Susan will not arrive at the airport on time she hurries up A．once B．if C．unless

问题补充：

Susan will not arrive at the airport on time she hurries up．

A．once B．if C．unless

答案：

解析：考查连词。once 一旦，if 如果，unless除非，句意：苏姗不会按时到达机场除非她快点。所以选C。