Healthy food and exercise help ­­­­to study better. A. us B. we C. our

问题补充：

Healthy food and exercise help ­­­­to study better.

A. us B. we C. our

答案：

解析：代词的用法。句中短语help sb. (to) do sth 意为“帮助某人做某事”，help后面用宾格。所以本题答案为A。