考研英语二的改错题目，旨在考察考生对英语语言表达的正确性和准确性。以下是对一典型改错题目的解答：
原文：The company, which has been struggling to increase its sales, decided to launch a new marketing campaign.
错误：launch 应改为 launch a
解答：在此句中，主语 "The company" 与动词 "decided" 之间需要插入一个宾语来使句子完整。正确的表达应该是 "decide to launch a new marketing campaign"，其中 "launch a new marketing campaign" 是 "decide" 的宾语。因此，错误在于缺少了 "a" 这个不定冠词，应将 "launch" 改为 "launch a"。
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