this is( )they solved the problems in the cityA.when B.that C.what D.how

This problem was so difficult they couldn't solve them.改写句子This problem was ( ) difficult ( ) ( ) ( ) solve. This is what they There is no simple -----(solve)to this problem. This is a s_____ problem.We must solve it This is what they 急用! This is the best way i think of()the problem A.solve B.to solve C.solving D.solved Is this the way you thought of ________ the problem?A.to solve B.solving C.solve D.solved This is the way_____has been used to solve this problem.填什么? This is the way in which they solve the problem.这里的in which可否换where?they solve the problem in the way是从句,主谓宾都有了,那就是缺副词了,定语从句里,关系副词只有where,when ,why,而且where = in which,那里这里 my destiny is to solve this problem,no matter how hard it is!意思是? They solve the problem________(different) Useing this method to solve this problem is impossible.这一句中,为什么is前的内容都是主语? any one can help me to solve this problem?in banking law,what is appropriation?what is set-off?is they are the same as one another?this question is related to banking law area...if u have any idea for these,do me a favor.thanks! It is easy to solve this problem.的另一种英语解释?xiexienimeno This problem is so difficult that f_____ student can solve it. this question is s___ to that,so we can solve it easily This problem is so_________(simply) that you can solve it by yourself 并解释为什么 This is a difficult question.Let's _____ and see how to solve it.