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题型：语法填空（单句） 题类：常考题 难易度：普通
新目标（Go for it）版初中英语九年级下学期Unit 13 We're trying tosave the earth! 第4课时Section B 2a~2同步练习
—Oh, I forgot _______.
It's difficult for us{#blank#}1{#/blank#}but we must help her.
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