<90.Through the project, many people have received 过去时training and ______（决定自己创业）decide 现在时to establish their own career..
建议答案: "Through the project, many people have received training and [decided to set up their own business.] OR: [decided to establish their own enteprise.]
91.建议答案: The anti-virus agent was not known [until it was discovered by chance by a doctor.] OR: [until it was discovered by a doctor incidentally.]
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