连词(连词)

解题思路： 连词
解题过程：
这道题答案应选C.
这是一种句型: 祈使句,+ and +句子. 这里祈使句相当于一个条件状语从句.注意下列句子:
Work hard ,and you may catch up with your classmates soon= If you work hard, you may catch up with your classmates soon.
也可等于Work hard ,or you may not catch up with your classmates soon. 其中or 表示"否则的话"=If you don't work hard, you may not catch up with your classmates soon.
最终答案：略