【单选题】【消耗次数：1】
Before?he came to China, he??[填空]Chinese for three years.
①
have learned
②
had learned
③
learned
④
learning
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Before he began to study in the university, he had worked in a company for three years.
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It was because he was too clumsy to drive a car that Jim hadnt learned to drive.
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If you learned a bit about calligraphy, the ?art of writing Chinese characters, you would realize there ______ a lot of ?pleasure in it.
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随机题目
【多选题】
有效组合满足()。
①
在各种风险条件下，提供最大的预期收益率
②
在各种风险条件下，提供最小的预期收益率
③
在各种预期收益率的水平条件下，提供最小的风险
④
各种预期收益率的水平条件下，提供最大的风险