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题型：单选题 题类：常考题 难易度：普通
上海本地版（五四制）九年级下册初中英语Module 2 Unit 4同步练习
—Yes, but his father put pressure on him to do exercise every day. So he becomes strong and does well in sport now.
— Not good. I can't understand English without mistakes.
—To see the ________ of butterflies(蝴蝶).
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