③ 接着，时间旅行者飞到了美国，他发现美国小朋友的生活也很丰富。（选择正确的选项）
() 1. It's time English class.
A. to B. at C. in D. for
() 2. Let's the playground.
A. go B. go to C. come D. come to
() 3. Look my clock.
A. at B. for C. to D. like
() 4. What time is it?
A. It's 7 o'clock. B. It's 7 clock.
C. At 7:00. D. On 7:00.

1.D 2.B 3.A 4.A