The problem is difficult,（ ）he has worked it out.A.howeverB.yetC.whileD.and为什么不能用however而要用yet?具体回答!

what is the problem His writing is so confusing that it is diffi difficult as the problem is The problem is ( )( )或( )( )(有点)( ) Choice,The problem is choice! 谁能帮我翻译一下,以下是什么意思?The problem is not the problem The problem is your attitude about the problem. What is the problem in the story? what is the problem in the problem-by-problem what is the chinese meaning? What the hell is your problem? What is the problem?的中文意思? what is the man problem 意思 What is pro-form?the linguistic problem the problem now is that i have lots of problem【】 to ask是problem还是problems Can be used to solve the problem of money is not problem,problem Can be used to solve the problem of money is not problem,problem是什么意思? the problem is not your face the biggest problem is your The b___ problem of the world is the interesting population