Questions 11-13 are based on the following talk about the history of daylight saving time. According to the speaker, when are clocks in the United States set back

A．In the spring.
B．In the summer.
C．In the fall.
D．In the winter.

Questions 11-13 are based on the following talk about the history of daylight saving time. According to the speaker, when are clocks in the United States set back 您的浏览器不支持 audio 元素。