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题型：单选题 题类： 难易度：普通
人教版九年级全册 Unit 1 How can we become good learners Section B
— That's great. It's a good way to save energy.
—A glass of water, please.
—No, I am not. I know when_______ to have a rest.
He {#blank#}1{#/blank#} {#blank#}2{#/blank#} {#blank#}3{#/blank#} {#blank#}4{#/blank#}late.
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