单项选择题A．No one knows how Mary gets to work.B．She doesn’t think the record player works.C．She throws the old record away.D．It’s surprising that Mary could repair the record player.

单项选择题A．The raid had been photographed by hidden cameras.B．Some watchman had seen the raid.C．The bank teller proved that Joe was the robber.D．Some monitors had been installed nearby.