不对。When 2 or more companies agree to work together in certain business activities, it is called an alliance.（结盟）

选择正确。When a company buys enough shares in another company to get control of it, it is called a takeover.（买断）

不对。When 2 or more companies are combined together, it is describes as a merger.（合并）

不对。When 2 or more companies work together on a project it is called a joint venture.（合资）

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