单选题：Although he has become rich, he is still very __________ of

题目内容：

Although he has become rich, he is still very __________ of his money. A．economic
B．thrifty
C．frugal
D．careful

参考答案：

答案解析：

根据合同的成立是否以交付标的物为要件可将合同分为（　　）。

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分类：专四题型：单选题

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