It was not the first time she ______ in the exam. I think its high time we ______ the trut

It was not the first time she ______ in the exam. I think its high time we ______ the truth to our headteacher.

A．cheated; tell

B．had cheated; told

C．has cheated; told

D．has cheated; tell

请帮忙给出正确答案和分析，谢谢！