【判断题】【消耗次数：1】
He has been in china for three years.
①
正确
②
错误
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相关题目
【单选题】
Before?he came to China, he??[填空]Chinese for three years.
①
have learned
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had learned
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learned
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【单选题】
he park has been built and it will be open _____ three years
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The population of many Alaskan cities has __________ doubled in the past three years.
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Lucy has been a student there for nearly one and [填空] half years．
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【判断题】
Before he began to study in the university, he had worked in a company for three years.
①
正确
②
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随机题目
【多选题】
关于黄酮类化合物的理化性质，下列说法正确的是
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黄酮类化合物都溶于水
②
黄酮类化合物因其结构不同，溶解度差异大
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黄酮苷一般易溶于水、乙醇、甲醇
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黄酮苷一般易溶于石油醚、氯仿等有机溶剂
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游离苷元易溶于水