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题型：语法填空（单句） 题类：常考题 难易度：普通
闽教版（三年级起点）小学英语五年级上册Unit 4 Part A 同步练习2
— They are busy _______ their science experiment.
⑴walked{#blank#}1{#/blank#} A. eggs
⑵wash{#blank#}2{#/blank#} B. bad
⑶tasted{#blank#}3{#/blank#} C. into street
⑷cooked{#blank#}4{#/blank#} D. clothes
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