The problem _______ you argued about yesterday has been solved.A.that B.what C.why D.for which为什么选A,不选D?

When I entered the room,the problem _______(discuss). The teachers can help us deal with the problem.（改为一般疑问句）_______ _______ _______ _______ the teachers,we can deal with the problem. They discussed the problem again and again last week =they _______ _________ the problem last week The problem is so difficult that I can't work it out.同义句The problem is _______ _______ difficult for me ______ work out. Was noise pollution a problem before the _______(close) of the old airprot? 1.She _______ the flat advertisement.A.has a problem with B.has a problem for1.She _______ the flat advertisement.A.has a problem withB.has a problem forC.has a problem of满分：5 分2._______ people are my friends._______ people are my husband's f The head teacher's ______ problem is that he is _______ busy. 1.The math problem is so difficult that I can't work it out.(改为简单句) The math problem is ______1.The math problem is so difficult that I can't work it out.(改为简单句)The math problem is _______ difficult _______ _______ _______ ______ what we have to do first is to find a _______（solve）to the problem. The problem is _______ he is too tired.A.which B.when C.what D.that The problem is not easy,but I am sure _______( work) it out _______(not tell)the truth,we had some trouble dealing with his problem. The problem is _______ to do next A.that B.what C.when D how we must solve the problem by ourselves.we can't ask others for help 同义句we must_____ _______ ourselves to solve the problem The problem is difficult for me to work out.(保持原句意思）The problem isn't ______ _______ for me to work out. My friend helps me work out the problem.(保持句意基本不变）My friend ____ me _______ the problem. Some people think the _______ problem at present is how to make the students developSome people think the _______ problem at present is how to make the students develop by themselves(education)为什么这里用education,而不是educational请详 With the help of a _______,you can work out the mathematical problem quickly.A.carB.planeC.computerD.Tv set