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题型：单选题 题类：常考题 难易度：普通
——________. Though I know they're bad for our health.
Labour Day in China is on 1st May, {#blank#}1{#/blank#} {#blank#}2{#/blank#} ?
— ___________, though he tried what he could.
— ________ Her parents are very busy with their work, so she has to do some cleaning every day．
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