29.（2.1分）9.We should be ___ of the Al development, reaping its benefits and avoiding its potential problems.A. for sureB. in actionC. by no meansD. in control

本题考查短语辨析，解题思路是理解每个选项短语的含义，再结合句子语境来判断哪个选项符合句子表达的逻辑。

• A选项“for sure”：意为“肯定地；毫无疑问地”。若将其代入句子“We should be for sure of the Al development, reaping its benefits and avoiding its potential problems.”，句子表达的意思是“我们应该肯定人工智能的发展，收获其好处并避免其潜在问题”，“be for sure of”这种表达不符合英语习惯，且语义上“肯定发展”与后面“避免潜在问题”的逻辑联系不紧密，所以A选项不正确。
• B选项“in action”：意思是“在行动；在运转”。把它放进句子“We should be in action of the Al development, reaping its benefits and avoiding its potential problems.”，“be in action of”这种搭配不存在，句子逻辑也不通顺，所以B选项不合适。
• C选项“by no means”：表示“决不；一点也不”。若用在句子中“We should be by no means of the Al development, reaping its benefits and avoiding its potential problems.”，“be by no means of”搭配错误，且语义与句子想要表达的积极应对人工智能发展的意思相悖，所以C选项错误。
• D选项“in control”：有“控制；掌管”的意思。“be in control of”是固定短语，意为“控制；管理”。将其代入句子“We should be in control of the Al development, reaping its benefits and avoiding its potential problems.”，句子意思为“我们应该控制人工智能的发展，收获其好处并避免其潜在问题”，语义通顺，逻辑合理，所以D选项正确。