本课程为收费课程，购买后即可观看完整内容
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- 00:00 免费1、Write the letter A
- 00:00 付费2、Write the letter B
- 00:00 付费3、Write the letter C
- 00:00 付费4、Write the letter D
- 00:00 付费5、Write the letter E
- 00:00 付费6、Write the letter F
- 00:00 付费7、Write the letter G
- 00:00 付费8、Write the letter H
- 00:00 付费9、Write the letter I
- 00:00 付费10、Write the letter J
- 00:00 付费11、Write the letter K
- 00:00 付费12、Write the letter L
- 00:00 付费13、Write the letter M
- 00:00 付费14、Write the letter N
- 00:00 付费15、Write the letter O
- 00:00 付费16、Write the letter P
- 00:00 付费17、Write the letter Q
- 00:00 付费18、Write the letter R
- 00:00 付费19、Write the letter S
- 00:00 付费20、Write the letter T
- 00:00 付费21、Write the letter U
- 00:00 付费22、Write the letter V
- 00:00 付费23、Write the letter W
- 00:00 付费24、Write the letter X
- 00:00 付费25、Write the letter Y
- 00:00
付费26、Write the letter Z