【单选题】【消耗次数：1】
I saw that she was in difficulty with all those parcels, so I offered my_____.
①
service
②
money
③
use
④
chance
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随机题目
【多选题】
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关于溶液的概念，下列说法正确的是?
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A.溶液是分散系的一种
②
B.溶液是多相体系
③
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④
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⑤
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