You have failed in the test again .You ( ) hard at

问题补充：

You have failed in the test again .You ( ) hard at your subject .A should have studied B must have studied C may have studied D need have studied

答案：

A 你本来应该在你的功课上努力学习

======以下答案可供参考======

供参考答案1:

A有不明白的地方再问哟，祝你学习进步，更上一层楼！ (*^__^*)