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The mother didn't know___________ is to blame for the broken glass as it happened while she was out.
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___________,子无良媒。将子无怒,秋以为期。(《诗经•氓》)
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一定条件下,甲、乙、丙、丁四种物质在密闭容器中反应,测得反应前后各物质的质量分数如图所示,下列说法正确的是( )
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The best times to visit Shangri-la are spring and autumn ___ the temperature is at its mildest.
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