【单选题】The expression“the ups and downs " in Para.4 means ________.回答 A.present and past situations B.good and bad experiences C.chances and challenges D.happy and sad feelings

【单选题】The expression“the ups and downs " in Para.4 means ________.回答

A.present and past situations
B.good and bad experiences
C.chances and challenges
D.happy and sad feelings

出自：广东开放大学学位外语（本，23春）

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