跨国公司负责人密集来华访问，商务部：来中国投资已从可选项升级为必选项

This pattern means to treat, regard, or use something as something else. It is common in formal written and business Chinese. The verb 将 makes the object come before the main action, and 作为 shows the role or identity assigned to that object.

This pattern shows a change from one stage, level, or status to another. 从 marks the starting point, and 到 marks the new point reached. 升级到 is often used in formal contexts to describe development or improvement.

This formal pattern is used to express having some kind of interaction, discussion, exchange, or cooperation with someone. 与 introduces the other party, and 进行 is followed by a formal action noun such as 沟通、交流、讨论、合作.

其中 is used to pick out a part of a larger group just mentioned, similar to 'among them' or 'of these'. It helps connect two clauses by narrowing the focus from the whole group to some members.

This pattern expresses that a considerable number of people or things share the same action or opinion. 不少 means 'quite a few', 很多 means 'many', and 都/均 emphasizes that this is true for all members of that group. 均 is a more formal written equivalent of 都.