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题型：单选题 题类：常考题 难易度：普通
湘少版2019-2020学年小学英语五年级上册Unit 5同步练习（音频暂未更新）
A. He is playing ping-pong.
B. They are climbing trees.
C. She is singing and dancing.
D. I'm doing my homework.
E. It's running on the grass.
—_______.
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