在美联英语的语法考研题目中，若要找到最佳答案，需对句型结构、时态语态、非谓语动词等语法点进行深入分析。以下是一例原创最佳答案：
题目：请选择下列句子中语法错误的一项。
A. He has been working in this company for five years.
B. The book is said to have been translated into many languages.
C. She is not only a talented singer but also a great actress.
D. I have finished my homework, and now I am going to do some exercise.
答案：D
解析：选项D中，“I have finished my homework”和“now I am going to do some exercise”分别表示过去和现在两个时间点，这两句话之间没有明确的逻辑关系，因此语法上存在错误。
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