【题目】He was still full of optimism for the future despite many problems, and never once ______ him get worried or upset.
A. I saw B. I would see
C. did I see D. would I see
在线课程【答案】C
【解析】
考查倒装句式。句意为：尽管有许多问题，他对未来仍然充满乐观，我从未见过他感到忧虑或不安。and连接两个并列句，后面一个句子是以否定词never开头，故用倒装结构，助动词置于主语前，且从前面的句子时态来看，确定是用一般过去时，故选C。