, I lost heart in English learning, but my teacher often said to me, “Keep on studying hard , and you’ll succeed             .”

A．At one time; in time

B．At one time; on time

C．At a time; in time

D．At a time; on time

Windows 98多媒体组件中，支持用户在PC上看到或听到实况或录音广播的是 ______。