(单选题)

When attending a trade negotiation, I did better, but still I wasn’t as focused as I ______.

A.could

B.should have been

C.could have

D.should do

参考答案：B

参考解析：

考查省略。句意：在参加贸易谈判时，我做得更好，但我仍然没有像我应该的那样专注。根据题干的“did”和“wasn’t”两个词的时态可知，此处描述的过去的事实，故排除A项和D项；题干还原为正常语序为When attending a trade negotiation, I did better, but still I wasn’t as focused as I should have been focused，前后语意重复的focused省略后就变成了“should have been”。故选B。

知识点：特殊句式英语专业基础知识英语语法教师招聘-小学英语