如何用in ignorance of ,be ignorant of ,be concern in 造句

题目

如何用in ignorance of ,be ignorant of ,be concern in 造句

答案

I am in ignorance of （knowing） how to use the machine.我不知道怎么用这台机器.
I'm ignorant of his plan.我对他的计划一无所知.
He is concern in the crime.他与犯罪案件有关