it is ___ difficult for us___climb the mountains 选哪个A.too ,to B.very ,to为什么不能选B？

It is not difficult to learn English.___ ___ ___ is not difficult.同义句 This problem is so difficult that nobody can work it out.It is ___ ___ ___problem_____nobody can work it out. it is difficult it is difficult at This question is very difficult.I can't answer it.This question is ___ difficult ___me ___answer. he is a ___(able) boy .It is difficult forhim to swim quickly the English article is not very difficult because there are only ___ new worda in it The problem is difficult.I can't work it out.（连成一句）The problem isn't ___ ___ ___ ___ to work out. Jim found it difficult to go to sleep 变为同意句It is hard for Jim to___ ___. The problen is difficult.I can't work it out.The problen is't easy ____ for ___ ___ woke it out改为同义句Let's go swimming.改为同义句___ ___ ___ swimming? Everythingt is difficult before it is parents found it is difficult/it difficult/it was difficult to teach children.说明选择原因 Greek is a language I found__to learn.A.is difficult B.it is difficult C.it difficult D.difficult. The question is not easy.It's very ___.A.difficult B.boring C.relaxing D.interesting I think it's difficult __(be)good at EnglishThe died fish is really ___(salt) for us. ---Is this math problem difficult? ---No, I can work it out ___ .A easily B friendly C really D differently it is ___ difficult for us___climb the mountains 选哪个A.too ,to B.very ,to为什么不能选B？ the text is not difficult.there are ___ new words in it .是a few 还是 few