I am not sure whether I can gain any profit from the investment, so I cant make a ____ promise to help you.
A. exact B. defined C. definite D. sure
[investment]
investment 投资
investigate 调查
irrigate 灌溉
irritable 激怒的
navigate 航行
castigate 惩罚
mitigate 缓和，调解，减轻
[/investment]
[sure]
sure 确信
insure 保险
ensure 确保
[/sure]
define 限定，下定义
final 结束的
refine 提纯
finance 财政，资金
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